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Nissan · Known Issues

2004 Nissan Altima Problems: 13 Known Issues

2004 model year · NHTSA recalls, manufacturer TSBs, and owner forum reports · Updated September 2026

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Issue summary

According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2004 Nissan Altima has 13 documented known issues, with 6 rated critical. The most serious are 2.5L Pre-Catalyst Breakdown Causing Excessive Oil Consumption and Engine Damage ($900-$4,500 repair), Rear Lower Control Arm Corrosion and Separation Risk ($0-$1,200 repair), Rusting Front Floorboards and Underbody Corrosion Near the Firewall/Subframe Area ($500-$3,000 repair), 2.5L QR25DE Head Gasket Failure Causing Coolant Loss and Overheating ($1,200-$2,500 repair), Engine Control Module Relay / ECM Power Interruption Causing Stall or No-Start ($0-$250 repair) and VQ35DE V6 Timing Chain Rattle from Worn Secondary Chain Guides and Tensioners ($1,200-$2,500 repair). Across all issues with published estimates, repair costs range from $60 to $4,500. DIY maintenance guides at au7o.io.

In This Article

  • Altima Engine4
  • Altima Suspension3
  • Altima Electrical2
  • Altima Body/Panels1
  • Altima Drivetrain1
  • Altima Exhaust1
  • Altima Emissions1
  • Recalls13
  • FAQ
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In This Article

  • Engine4
  • Suspension3
  • Electrical2
  • Body/Panels1
  • Drivetrain1
  • Exhaust1
  • Emissions1
  • Recalls13
  • FAQ
  • All 13 Known Issues

    Filter:
    ALL YEARS2025202420232022202120202019201820172016201520142013201220112010200920082007200620052004200320022001200019991998

    When Issues Typically Appear

    Engine Control Module Relay / ECM Power Interruption Causing Stall or No-Start
    40K-140K
    2.5L Pre-Catalyst Breakdown Causing Excessive Oil Consumption and Engine Damage
    60K-140K
    Rear Lower Control Arm Corrosion and Separation Risk
    70K-180K
    Crankshaft and Camshaft Position Sensor Failures Causing Stalling or No-Start
    70K-160K
    Power Steering Rack and High-Pressure Hose Leaks Leading to Loss of Assist
    80K-180K
    Front Wheel Bearing and Hub Failure Causing Humming Noise and ABS/Wheel Speed Issues
    90K-180K
    Rusting Front Floorboards and Underbody Corrosion Near the Firewall/Subframe Area
    100K-220K
    063K125K188K250K mi

    On the 2002-2006 Nissan Altima 2.5L QR25DE I4, on many 2.5L QR25DE Altimas, the pre-catalytic converter material can deteriorate and be drawn back into the engine during valve overlap, scoring cylinder walls and accelerating oil consumption. Owners report needing to add oil frequently, loss of compression, rough running, and in severe cases complete engine failure. This issue is widely discussed in owner communities and tied to Nissan service information addressing catalyst and ECM updates on affected 2.5L cars.

    Common Symptoms

    • excessive oil consumption
    • blue exhaust smoke
    • check engine light
    • rough idle
    • loss of power
    • engine knocking
    • failed emissions test

    How to Fix

    Diagnosis usually includes checking oil consumption, compression, catalyst condition, and inspecting for catalyst substrate breakup. Repairs range from replacing the pre-cat/manifold and upstream O2 sensor to replacing the engine if cylinder damage is already present. Owners also commonly verify ECM calibration updates and monitor oil level closely after repair.

    What you need to fix it

    Only diagnosis- and fitment-reviewed repair parts are linked here.

    • Evan Fischer REPN960339 integrated front manifold catalytic converter

      Confirm emissions label, engine family and local law before purchase; gasket included.

      CarParts.com

    As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.

    Owner tips & cautions

    • TipIf a 2.5L Altima is using oil, inspect the pre-cat before simply replacing valve cover gaskets or PCV parts; continued driving can turn a catalyst issue into a full engine replacement.
    • TipPerform compression and leak-down testing before authorizing repairs, because many owners found the catalyst was only part of the problem once cylinder scoring had started.
    Typical repair cost:$900 - $4,500

    Research This Issue

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    High Confidence

    On the 2002-2006 Nissan Altima, the first-generation-era 2.5L QR25DE (2002-2006) is well known for head gasket failure. Because the QR25 uses an open-deck block, the combustion ring of the gasket commonly fails into the combustion chamber, so owners often see disappearing coolant, overheating, and white exhaust smoke without the classic milky oil. Failures are frequently linked to the pre-catalyst breaking up and scoring cylinders (raising heat/pressure) and to the secondary block thermostat sticking closed. Left unrepaired it leads to chronic overheating and potential warped-head / engine damage.

    Common Symptoms

    • Unexplained coolant loss with no visible puddle
    • Overheating, especially under load
    • White smoke from the exhaust
    • Overflow tank overfilling/bubbling
    • Misfire or rough running from coolant in a cylinder

    How to Fix

    Pressure/combustion-leak test the cooling system to confirm. Repair requires removing the head, inspecting/machining for warpage, and installing a new MLS head gasket set with new head bolts. OEM cylinder head gasket for the 2.5L QR25DE is in the 11044- family (e.g., 11044-8J022 for ~2006, supersedes 11044-8J020/8J010; 11044-6N202 also referenced). Replace the secondary block thermostat while in there and address any pre-cat breakdown. Typical repair runs $1,200-$2,500+.

    What you need to fix it

    Only diagnosis- and fitment-reviewed repair parts are linked here.

    • Fel-Pro HS26261PT QR25DE cylinder-head gasket set

      Verify engine/VIN and machine-surface requirements.

      PartsGeek
    • Fel-Pro ES72198 QR25DE head-bolt set

      2002-2006 Altima 2.5L QR25DE within the page's broader 2002-2020 fitment; confirm engine/VIN and follow the exact torque-angle sequence.

      PartsGeek
    • OEM Nissan 2002-2006 Altima 2.5L water-control valve 21230-6N20A

      2002-2006 Nissan Altima 2.5L QR25DE; conditional on diagnosis and not a substitute for the primary thermostat or head-gasket testing. Fitment/availability: In stock and add-to-cart live at review

      Z1 Motorsports

    As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.

    Typical repair cost:$1,200 - $2,500

    Research This Issue

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    Community Reported
    Medium ConfidenceVerifiedReviewed Jun 2026

    On the 2002-2018 Nissan Altima, on the 3.5L VQ35DE V6 the plastic secondary timing chain guides/tensioner shoes become brittle and break, and the secondary (cam) chain tensioners lose tension. This produces a loud rattle or whine from the front of the engine, most pronounced for the first few seconds of a cold start. When a guide breaks, the chain runs slack and can contact the tensioner piston (the 'death rattle'), risking valve-timing skip and internal damage if ignored. Owners across multiple Altima forums document this as one of the defining VQ35DE problems, and there is a Nissan TSB covering secondary-chain replacement.

    Common Symptoms

    • Loud rattle from front of engine on cold start lasting a few seconds
    • Whining or buzzing noise from timing cover area
    • Rattle that returns and worsens over time
    • Possible check engine light for camshaft/crankshaft correlation if chain skips

    How to Fix

    Diagnose with a cold-start listen plus inspection of the front cover for guide debris. The fix is replacing the secondary timing chains, tensioner shoes/guide rails, and tensioners (and typically the primary chain components and oil seals) as a complete kit while the front cover is off. Per the Nissan secondary-chain TSB, key OEM parts are secondary chains 13028-ZK01C (x2) and tensioner-shoe/guide rails 13097-ZK01C (x2) plus o-rings/seals. Use OEM or quality kits; do all guides, tensioners, and chains together. It is 8-14 hours of labor due to front-cover access.

    What you need to fix it

    Only diagnosis- and fitment-reviewed repair parts are linked here.

    • Genuine Nissan secondary camshaft timing chain 13028-ZK01C

      Quantity two; confirm VIN/current supersession.

      NissanPartsDeal
    • Genuine Nissan secondary-chain tensioner shoe 13097-ZK01C

      Quantity two; retailer page does not publish a fitment table, so confirm part number 13097-ZK01C by VIN before purchase.

      NissanPartsDeal
    • Genuine Nissan front crankshaft oil seal 13510-7Y000

      Confirm all additional O-rings and seals from the current service procedure by VIN.

      NissanPartsDeal

    As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.

    Typical repair cost:$1,200 - $2,500

    Research This Issue

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    Community Reported
    Medium ConfidenceVerifiedReviewed Jun 2026

    On the 2002-2018 Nissan Altima, the 2.5L QR25DE four-cylinder is widely documented for repeated coil-on-plug ignition coil failures, with cylinders 1 and 4 (the end cylinders) failing most often. A failing coil triggers a single-cylinder misfire, rough idle, hesitation, and a flashing check engine light. Failures are frequently accelerated by oil leaking from the valve cover gasket / spark-plug tube seals saturating the coil boots, so coils can fail again soon after replacement if the oil leak is not addressed. A persistent misfire dumps raw fuel into the catalytic converter and can damage it.

    Common Symptoms

    • Rough idle and shaking at stops
    • Flashing or steady check engine light
    • Hesitation or stumble under acceleration
    • Single-cylinder misfire code, often cyl 1 or 4
    • Repeat coil failure when valve cover gasket leaks oil onto boot

    How to Fix

    Confirm the bad coil by swapping the suspect coil to an adjacent cylinder and verifying the misfire follows it (e.g., P0301 becomes P0302). Replace the failed coil (OEM 22448-JA00C for 2007-2013, 22448-8H315-era for 2002-2006) and inspect coil boots and spark-plug wells for oil. If oil is present, replace the valve cover gasket / tube seals. Replace spark plugs at the same time; consider replacing all four coils on high-mileage cars. A new OEM coil runs roughly $30-$70 each.

    What you need to fix it

    Only diagnosis- and fitment-reviewed repair parts are linked here.

    • OEM 2002-2006 Altima QR25DE ignition coil

      Confirm VIN/production date and do not buy four solely because one failed.

      Z1 Motorsports
    • OEM 2007-2018 Altima QR25DE ignition coil 22448-1KT1A

      2007-2018 Altima 2.5L QR25DE and 2008-2013 coupe 2.5L; sold individually. Nissan 22448-1KT1A supersedes JA00C family.

      Z1 Motorsports
    • OEM 2002-2006 Altima spark plug

      2002-2006 Altima 2.5L QR25DE; quantity four. Select the service-manual heat range; page also lists V6 applications outside this card.

      Z1 Motorsports
    • OEM 2007-2013 Altima QR25DE spark plug

      2007-2012 Altima sedan 2.5L and 2008-2013 coupe 2.5L QR25DE; quantity four. Resolve 2013 by body style.

      Z1 Motorsports
    • OEM 2013-2018 Altima QR25DE spark plug

      Confirm exact Nissan/NGK specification by VIN.

      Z1 Motorsports
    • Replacement N01-044 valve cover with gasket

      Verify included tube seals and VIN before installation.

      PartsGeek
    • DIY Solutions ENG00367 valve cover with gasket

      Confirm PCV/tube-seal configuration.

      PartsGeek
    • Genuine W0133-1982825 valve cover with tube seals

      2013-2018 Altima sedan 2.5L QR25DE; separate perimeter gasket 13270-3TS0A is required. 2018 production cutoff must be checked.

      PartsGeek

    As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.

    Typical repair cost:$60 - $400

    Research This Issue

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    Community Reported
    Medium ConfidenceVerifiedReviewed Jun 2026

    On the 2002-2006 Nissan Altima, in salt-belt states, 2002-2006 Altimas have a documented corrosion problem affecting the rear lower control arms. Severe rust can perforate the arm and eventually lead to cracking or separation, which alters rear wheel alignment and can affect vehicle control. Nissan issued a recall in affected regions after owner reports of heavy corrosion and suspension instability.

    Common Symptoms

    • rear suspension clunk
    • uneven rear tire wear
    • vehicle feels unstable from rear
    • visible rust on rear control arm
    • rear alignment out of spec

    How to Fix

    Inspect the rear lower control arms carefully, especially around spring seats and high-corrosion areas, and check whether the regional recall was completed. If rust scaling, perforation, or deformation is present, replace both rear lower control arms and perform a four-wheel alignment. Vehicles in rust-prone areas should also have the rear suspension and underbody treated with rust inhibitor after repair.

    Typical repair cost:$0 - $1,200

    Research This Issue

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    High Confidence

    On the 2002-2012 Nissan Altima, hydraulic power steering Altimas commonly develop leaks from the steering rack seals or high-pressure hose assemblies. Owners report groaning noises, fluid on the subframe, a burning smell from fluid contacting hot components, and progressively heavier steering effort. On higher-mileage cars the leak can become severe enough to empty the reservoir and sharply reduce steering assist.

    Common Symptoms

    • power steering fluid leak
    • groaning while turning
    • heavy steering
    • whining pump noise
    • fluid under front of car
    • burning fluid smell

    How to Fix

    Diagnosis involves checking the reservoir level, inspecting the pressure hose crimps and rack boots for fluid, and verifying whether the pump has been damaged by low fluid operation. Repairs typically involve replacing the leaking hose or steering rack, flushing the system, and refilling with the correct fluid. Alignment is usually required after rack replacement.

    What you need to fix it

    Only diagnosis- and fitment-reviewed repair parts are linked here.

    • Replacement 419-043 steering rack with inner tie rods

      Verify VIN, ports and pressure-switch configuration.

      PartsGeek
    • Cardone 26-3038E remanufactured steering rack

      2007-2012 Altima 2.5L/3.5L for this card within the page's broader 2007-2013 fitment; verify body, VIN, hydraulic steering and EVO configuration.

      PartCatalog
    • Edelmann 92571 power-steering return-line assembly

      2002-2006 Altima 2.5L QR25DE or 3.5L VQ35DE; cooler-tube/return assembly, not the high-pressure pump-to-rack hose. Fitment/availability: Direct add-to-cart product page live at review

      PartsGeek
    • Omega W0133-2620760 VQ35DE pressure hose

      2002-2006 Altima 3.5L VQ35DE; pressure switch is serviced separately. Not for the 2.5L.

      PartsGeek
    • Sunsong 3401160 QR25DE pressure-line assembly

      Verify switch-port need.

      PartsGeek
    • Nichirin W0133-2900763 VQ35DE pipe-to-rack pressure hose

      2007-2012 Altima 3.5L VQ35DE with listed body/production splits; confirm VIN, tube configuration and production date.

      PartsGeek

    As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.

    Owner tips & cautions

    • TipIf the reservoir keeps dropping, inspect the rack boots and hose crimps before replacing the pump; many owners replaced noisy pumps only to find the real problem was a leak.
    • TipAfter any rack or hose repair, flush contaminated fluid out of the system to reduce repeat pump noise and seal wear.
    Typical repair cost:$250 - $1,400

    Research This Issue

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    Community Reported
    High Confidence

    On the 2002-2012 Nissan Altima, repairPal documents front struts wearing prematurely on the Altima and producing a knocking/clunking noise from the front end, especially over bumps and uneven roads. The noise often comes from worn strut internals or a failing upper strut mount/bearing. Beyond noise and a bouncy ride, worn struts increase stopping distance and reduce stability, so it is a handling-and-safety wear item commonly needed around 60,000-80,000 miles.

    Common Symptoms

    • Clunk or knock from front end over bumps
    • Bouncy or floaty ride
    • Nose dive under braking
    • Uneven/cupped front tire wear
    • Rattle from strut mount area

    How to Fix

    Inspect struts and strut mounts (also check sway-bar end links and control-arm bushings, which can mimic the same clunk). Replace front struts in matched pairs — loaded quick-strut assemblies simplify the job — and perform a four-wheel alignment afterward. OEM front strut part numbers for 2002-2006 include the 54302-xxxxx family (e.g., 54302-9E125); 2002-2007 use E4302-ZB03B-type members for some configurations. Quality complete strut assemblies are widely available aftermarket.

    What you need to fix it

    Only diagnosis- and fitment-reviewed repair parts are linked here.

    • Unity 2-11593-11594-001 front complete-strut pair

      2002-2006 Altima 2.5L QR25DE; excludes V6/SE-R. Includes both front complete assemblies.

      PartsGeek
    • Detroit Axle 171426/171427 front complete-strut pair

      2002-2006 Altima 3.5L VQ35DE including listed SE-R/SE/S/SL/Base applications; confirm exact trim/VIN.

      PartsGeek
    • TRQ SCA57088 front complete-strut pair

      2007-2012 Altima sedan/coupe 2.5L or 3.5L and 2007-2011 Hybrid per retailer fitment; select exact vehicle before purchase. Fitment/availability: In stock; add-to-cart live at review

      1A Auto

    As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.

    Typical repair cost:$300 - $800

    Research This Issue

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    Community Reported
    Medium ConfidenceVerifiedReviewed Jun 2026

    On the 2002-2006 Nissan Altima, a well-documented problem on 2002-2006 Altima involves failure of the engine control module (ECM) relay, which can interrupt power to the ECM while driving or prevent the car from starting. Owners report sudden stalling, intermittent crank-no-start, or an engine that dies and restarts after cooling down. Nissan issued a safety recall because relay heat damage and internal failure could cause an unexpected engine stall.

    Common Symptoms

    • engine stalls while driving
    • intermittent no-start
    • cranks but will not start
    • engine restarts after sitting
    • loss of power with warning lights illuminated

    How to Fix

    Confirm recall completion status by VIN first. Diagnosis typically includes checking for ECM power loss, relay operation, and signs of heat damage or intermittent contact in the IPDM/relay circuit. The fix is replacement of the ECM relay with the updated part per recall procedure; if symptoms persist, inspect related fuse box terminals and wiring for overheating or poor pin tension.

    Typical repair cost:$0 - $250

    Research This Issue

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    Community Reported
    High Confidence

    On the 2002-2012 Nissan Altima, altimas in this period frequently suffer from failing crankshaft position sensors and camshaft position sensors, especially on the 2.5L and 3.5L engines. Owners report intermittent stalling at stops or while driving, extended cranking, sudden no-start conditions, and check-engine lights. Nissan issued service information and many owner reports describe repeat failures with cheap aftermarket sensors.

    Common Symptoms

    • engine stalls while driving
    • intermittent no-start
    • long crank time
    • tachometer drops to zero
    • check engine light
    • hard restart when hot

    How to Fix

    Diagnosis includes scanning for correlation and sensor circuit codes, checking live RPM signal during cranking, and inspecting harness connectors for oil contamination or heat damage. The most reliable fix is replacing the failed sensor(s) with OEM-quality parts and clearing codes; in some cases both cam and crank sensors are replaced together due to similar age and failure patterns.

    What you need to fix it

    Only diagnosis- and fitment-reviewed repair parts are linked here.

    • Genuine Nissan 23731-6N21A crankshaft position sensor

      2002-2006 Nissan Altima 2.5L QR25DE; confirm VIN, DTC and sensor location because catalog terminology can overlap cam/crank/magnet sensor names.

      NissanPartsDeal
    • OEM Nissan 2002-2006 Altima 3.5L camshaft position sensor

      2002-2006 Nissan Altima 3.5L VQ35DE; select the DTC-identified bank/side and verify current Nissan part number.

      Z1 Motorsports
    • Genuine Nissan 23731-JA00C crankshaft/magnet sensor

      Confirm VIN, DTC and sensor location.

      NissanPartsDeal
    • Genuine Nissan 23731-JA11B camshaft position sensor

      Verify VIN, DTC and location; do not infer quantity.

      NissanPartsDeal
    • Genuine Nissan 23731-JA10C crankshaft position sensor

      2007-2012 Nissan Altima 3.5L VQ35DE for this card; confirm VIN, exact DTC and crank-sensor location.

      NissanPartsDeal

    As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.

    Owner tips & cautions

    • TipUse OEM or OEM-supplier sensors; many owners report repeat failures within months when using the cheapest aftermarket cam/crank sensors.
    • TipIf one sensor fails on a high-mileage car, many owners proactively replace the matching cam/crank sensors together to avoid another breakdown soon after.
    Typical repair cost:$150 - $600

    Research This Issue

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    Community Reported
    High Confidence

    On the 2000-2006 Nissan Altima, older Altimas in rust-belt climates are known for severe floorboard and underbody corrosion, especially around the front floor pan, firewall seams, and nearby structural mounting areas. Owners report soft floors, water intrusion, failed inspections, and concerns about structural integrity around suspension or subframe attachment points. The issue is most common on early-2000s cars that saw repeated winter salt exposure.

    Common Symptoms

    • soft floorboards
    • visible rust holes under car
    • water on front carpet
    • musty interior smell
    • failed safety inspection
    • subframe area corrosion

    How to Fix

    Inspection should include lifting carpets, probing floor pan seams, and checking the subframe and adjacent mounting points for perforation. Minor corrosion can sometimes be cut out and welded with rust treatment, but advanced structural rust often makes the vehicle uneconomical to repair. Keeping drains clear and addressing windshield or cowl leaks can slow recurrence after repair.

    Owner tips & cautions

    • TipPull the front carpet and inspect from inside as well as underneath; several owners found much worse rust hidden by sound deadening and wet carpet.
    • TipIf buying an early-2000s Altima in a salt state, inspect the floor pan and subframe before spending money on engine or transmission work.
    Typical repair cost:$500 - $3,000

    Research This Issue

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    Community Reported
    Medium Confidence

    On the 2002-2012 Nissan Altima, a recurring higher-mileage Altima problem is front wheel bearing wear, often first noticed as a humming or growling noise that increases with road speed. As the bearing deteriorates, owners may feel vibration, looseness, or see ABS warnings if the integrated wheel speed signal becomes erratic. This is widely reported in repair databases and owner forums, especially on cars driven on rough roads.

    Common Symptoms

    • humming noise from front wheel
    • growling that changes with speed
    • vibration
    • ABS light
    • wheel play
    • noise changes when turning

    How to Fix

    Diagnosis includes road testing for load-sensitive humming, checking for play at the wheel, and using a chassis ear or scan tool to compare wheel speed signals if ABS lights are present. Repair typically requires replacing the affected hub/bearing assembly or pressing in a new bearing depending on model year and setup. An alignment check is wise if other front-end wear is present.

    What you need to fix it

    Only diagnosis- and fitment-reviewed repair parts are linked here.

    • Genuine Nissan front wheel bearing 40210-3Z000

      Confirm axle-nut and seal requirements by VIN.

      NissanPartsDeal
    • Genuine Nissan QR25DE front hub 40202-9HC1A

      2007-2012 Nissan Altima 2.5L QR25DE for this card, within the page's broader 2007-2013 fitment; left or right front. Not for VQ35DE.

      NissanPartsDeal
    • Genuine Nissan VQ35DE front hub 40202-3JA1A

      2007-2012 Altima 3.5L VQ35DE for this card, left or right front; verify VIN/current supersession.

      NissanPartsDeal

    As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.

    Owner tips & cautions

    • TipDo not assume tire noise; many owners chased alignment and tire issues before confirming the bearing by loading the car side-to-side during a road test.
    • TipIf an ABS light appears with bearing noise, inspect the hub tone ring/sensor signal before replacing separate ABS components.
    Typical repair cost:$250 - $700

    Research This Issue

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    Community Reported
    Medium Confidence

    On the 2002-2016 Nissan Altima, the exhaust manifold on the Altima is prone to developing cracks from repeated heat cycling, producing a ticking/tapping noise from the front of the engine that is loudest on cold start (and often quiets as the metal expands and the crack closes), along with an exhaust smell and a leak ahead of the catalyst. On many 2.5L model years the manifold is integrated with the front catalytic converter, so a cracked manifold and a P0420 catalyst fault often go together and make replacement more involved.

    Common Symptoms

    • Ticking/tapping from the engine bay, worst on cold start
    • Exhaust or sulfur smell
    • Hissing/puffing exhaust leak sound
    • Often paired with a P0420 catalyst code

    How to Fix

    Confirm the leak by listening for a cold-start tick and inspecting the manifold/gasket for soot or visible cracks (a smoke or soapy-water test on the flange helps). Replace the cracked exhaust manifold (or the integrated manifold/catalyst assembly on cars where they are one piece) and renew the manifold and downpipe gaskets. Address related catalyst codes at the same time. On affected 2018 cars the manifold/catalyst was covered under emissions recall PC717.

    What you need to fix it

    Only diagnosis- and fitment-reviewed repair parts are linked here.

    • Evan Fischer REPN960339 integrated manifold catalytic converter

      Confirm underhood emissions label, engine family and local law.

      CarParts.com
    • Evan Fischer REPN960335SS integrated manifold catalytic converter

      Verify emissions label and local restrictions.

      CarParts.com
    • Dorman 674-149 integrated exhaust manifold and catalytic converter

      Confirm VIN and emissions label.

      FinditParts

    As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.

    Typical repair cost:$300 - $1,500

    Research This Issue

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    Community Reported
    Medium ConfidenceVerifiedReviewed Jun 2026

    On the 2002-2021 Nissan Altima, p0420 (catalyst system efficiency below threshold) is one of the most common check-engine codes on the 2.5L Altima. The integrated exhaust-manifold/catalyst on these cars loses efficiency as the substrate degrades, the downstream oxygen sensor begins tracking the upstream sensor, and the ECM sets P0420. Untreated upstream causes — misfires, oil consumption, or a failing O2 sensor — accelerate catalyst breakdown. Because the front (main) catalyst is integrated with the exhaust manifold on many model years, replacement is costlier than a typical under-car converter. Nissan ran emissions recall PC717 on certain 2018 Altimas (QR25DE) that replaced the exhaust manifold/three-way catalyst assembly and two exhaust sensors at no charge.

    Common Symptoms

    • Check engine light with P0420
    • Reduced fuel economy
    • Sometimes rotten-egg smell or sluggish performance
    • Failed emissions test

    How to Fix

    Diagnose the root cause before replacing the converter: check for misfires, oil consumption, exhaust leaks, and a lazy/failed downstream O2 sensor (a bad rear sensor alone can mimic P0420). Replace the catalyst/manifold assembly with a CARB-compliant unit where required. For affected 2018 models verify VIN against emissions recall PC717 for a free repair. Average converter replacement is roughly $1,200-$1,850 depending on whether the integrated manifold assembly is needed.

    What you need to fix it

    Only diagnosis- and fitment-reviewed repair parts are linked here.

    • Evan Fischer REPN960339 integrated manifold catalytic converter

      Not legal/shippable for listed California-emissions states; verify underhood label and engine family.

      CarParts.com
    • Evan Fischer REPN960335SS integrated manifold catalytic converter

      Confirm emissions label, engine family and local law.

      CarParts.com
    • Dorman 674-149 integrated exhaust manifold and catalytic converter

      Verify VIN, emissions label and current campaign status.

      FinditParts
    • A-Premium front catalytic converter for 2.5L FWD Altima

      Federal EPA application only; confirm emissions label, engine family and local restrictions.

      Walmart
    • AP Exhaust 641623 catalytic converter

      Confirm emissions label, engine family and local law.

      CarParts.com

    As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.

    Typical repair cost:$300 - $1,850

    Research This Issue

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    Community Reported
    Medium ConfidenceVerifiedReviewed Jun 2026
    NHTSA Recalls13 recalls

    TIRES

    Nissan North America, Inc. (Nissan) is recalling certain 2019-2020 Altima and 2018-2021 Titan vehicles equipped with Continental tires. On the affected vehicles, it is possible that one or more tires were cured for too long during tire production.

    Campaign #21V16900011/03/2021

    STEERING:LINKAGES:TIE ROD ASSEMBLY

    Nissan North America, Inc. (Nissan) is recalling certain 2020-2021 Nissan Altima vehicles. The tie rod ball joint fastener was not tightened properly, which could result in the tie rod ball joint detaching from the steering knuckle.

    Campaign #21V13800004/03/2021

    VISIBILITY:GLASS, SIDE/REAR

    Nissan North America, Inc. (Nissan) is recalling certain 2020 Altima, Maxima and Leaf vehicles. The rear window glass may not remain properly secured to the vehicle.

    Campaign #20V57000022/09/2020

    BACK OVER PREVENTION: SENSING SYSTEM: CAMERA

    Nissan North America, Inc. (Nissan) is recalling certain 2019-2021 Altima and 2020-2021 Sentra vehicles. Damage to the camera harness can cause distortion or loss of the rearview camera display image. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 111, "Rear Visibility."

    Campaign #23V62800008/09/2023

    TIRES

    Nissan North America, Inc. (Nissan) is recalling certain 2020 Altima S grade vehicles equipped with Continental ProContact TX tires, size 215/60 R16 H, with TIN date code 3320 and Mold ID S-419149. The tires may have been over cured.

    Campaign #20V68500005/11/2020

    + 8 more recalls. Check all on NHTSA.gov

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    Other Nissan Models

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    Frequently Asked Questions

    What are the most common Nissan Altima problems?

    According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2004 Nissan Altima has 13 documented issues. The most frequently reported are: 2.5L Pre-Catalyst Breakdown Causing Excessive Oil Consumption and Engine Damage, Rear Lower Control Arm Corrosion and Separation Risk, Rusting Front Floorboards and Underbody Corrosion Near the Firewall/Subframe Area. Of these, 6 are rated critical and should be addressed promptly.

    Is the Nissan Altima reliable?

    The 2004 Nissan Altima has 13 known issues compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. 6 issues are rated critical: 2.5L Pre-Catalyst Breakdown Causing Excessive Oil Consumption and Engine Damage and Rear Lower Control Arm Corrosion and Separation Risk and Rusting Front Floorboards and Underbody Corrosion Near the Firewall/Subframe Area and 2.5L QR25DE Head Gasket Failure Causing Coolant Loss and Overheating and Engine Control Module Relay / ECM Power Interruption Causing Stall or No-Start and VQ35DE V6 Timing Chain Rattle from Worn Secondary Chain Guides and Tensioners. Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.

    How much does it cost to fix common Nissan Altima problems?

    Repair costs for known Nissan Altima issues range from $0 to $4,500, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, 2.5L Pre-Catalyst Breakdown Causing Excessive Oil Consumption and Engine Damage, typically costs $900-$4,500 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

    What is the 2002-2006 Nissan Altima 2.5L Pre-Catalyst Breakdown Causing Excessive Oil Consumption and Engine Damage?

    On many 2.5L QR25DE Altimas, the pre-catalytic converter material can deteriorate and be drawn back into the engine during valve overlap, scoring cylinder walls and accelerating oil consumption. Owners report needing to add oil frequently, loss of compression, rough running, and… Repairs typically run $900-$4,500. Severity: high.

    What is the 2002-2006 Nissan Altima Rear Lower Control Arm Corrosion and Separation Risk?

    In salt-belt states, 2002-2006 Altimas have a documented corrosion problem affecting the rear lower control arms. Severe rust can perforate the arm and eventually lead to cracking or separation, which alters rear wheel alignment and can affect vehicle control. Nissan issued a rec… Repairs typically run $0-$1,200. Severity: high.

    What is the 2000-2006 Nissan Altima Rusting Front Floorboards and Underbody Corrosion Near the Firewall/Subframe Area?

    Older Altimas in rust-belt climates are known for severe floorboard and underbody corrosion, especially around the front floor pan, firewall seams, and nearby structural mounting areas. Owners report soft floors, water intrusion, failed inspections, and concerns about structural… Repairs typically run $500-$3,000. Severity: high.

    What is the 2002-2006 Nissan Altima 2.5L QR25DE Head Gasket Failure Causing Coolant Loss and Overheating?

    The first-generation-era 2.5L QR25DE (2002-2006) is well known for head gasket failure. Because the QR25 uses an open-deck block, the combustion ring of the gasket commonly fails into the combustion chamber, so owners often see disappearing coolant, overheating, and white exhaust… Repairs typically run $1,200-$2,500. Severity: high.

    What is the 2002-2006 Nissan Altima Engine Control Module Relay / ECM Power Interruption Causing Stall or No-Start?

    A well-documented problem on 2002-2006 Altima involves failure of the engine control module (ECM) relay, which can interrupt power to the ECM while driving or prevent the car from starting. Owners report sudden stalling, intermittent crank-no-start, or an engine that dies and res… Repairs typically run $0-$250. Severity: high.

    What is the 2002-2018 Nissan Altima VQ35DE V6 Timing Chain Rattle from Worn Secondary Chain Guides and Tensioners?

    On the 3.5L VQ35DE V6 the plastic secondary timing chain guides/tensioner shoes become brittle and break, and the secondary (cam) chain tensioners lose tension. This produces a loud rattle or whine from the front of the engine, most pronounced for the first few seconds of a cold… Repairs typically run $1,200-$2,500. Severity: high.

    What is the 2002-2012 Nissan Altima Power Steering Rack and High-Pressure Hose Leaks Leading to Loss of Assist?

    Hydraulic power steering Altimas commonly develop leaks from the steering rack seals or high-pressure hose assemblies. Owners report groaning noises, fluid on the subframe, a burning smell from fluid contacting hot components, and progressively heavier steering effort. On higher-… Repairs typically run $250-$1,400. Severity: medium.

    What is the 2002-2012 Nissan Altima Crankshaft and Camshaft Position Sensor Failures Causing Stalling or No-Start?

    Altimas in this period frequently suffer from failing crankshaft position sensors and camshaft position sensors, especially on the 2.5L and 3.5L engines. Owners report intermittent stalling at stops or while driving, extended cranking, sudden no-start conditions, and check-engine… Repairs typically run $150-$600. Severity: medium.

    What is the 2002-2012 Nissan Altima Front Wheel Bearing and Hub Failure Causing Humming Noise and ABS/Wheel Speed Issues?

    A recurring higher-mileage Altima problem is front wheel bearing wear, often first noticed as a humming or growling noise that increases with road speed. As the bearing deteriorates, owners may feel vibration, looseness, or see ABS warnings if the integrated wheel speed signal be… Repairs typically run $250-$700. Severity: medium.

    What is the 2002-2012 Nissan Altima Premature Front Strut Wear Causing Knocking / Clunk Over Bumps?

    RepairPal documents front struts wearing prematurely on the Altima and producing a knocking/clunking noise from the front end, especially over bumps and uneven roads. The noise often comes from worn strut internals or a failing upper strut mount/bearing. Beyond noise and a bouncy… Repairs typically run $300-$800. Severity: medium.

    What is the 2002-2016 Nissan Altima Exhaust Manifold Cracking Causing Ticking Noise and Exhaust Leak?

    The exhaust manifold on the Altima is prone to developing cracks from repeated heat cycling, producing a ticking/tapping noise from the front of the engine that is loudest on cold start (and often quiets as the metal expands and the crack closes), along with an exhaust smell and… Repairs typically run $300-$1,500. Severity: medium.

    What is the 2002-2018 Nissan Altima QR25DE Ignition Coil Failures Causing Misfires (Cylinders 1 and 4)?

    The 2.5L QR25DE four-cylinder is widely documented for repeated coil-on-plug ignition coil failures, with cylinders 1 and 4 (the end cylinders) failing most often. A failing coil triggers a single-cylinder misfire, rough idle, hesitation, and a flashing check engine light. Failur… Repairs typically run $60-$400. Severity: medium.

    What is the 2002-2021 Nissan Altima Catalytic Converter Efficiency Failure (P0420) on the QR25DE?

    P0420 (catalyst system efficiency below threshold) is one of the most common check-engine codes on the 2.5L Altima. The integrated exhaust-manifold/catalyst on these cars loses efficiency as the substrate degrades, the downstream oxygen sensor begins tracking the upstream sensor,… Repairs typically run $300-$1,850. Severity: medium.

    Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.

    Data compiled from NHTSA recalls, manufacturer TSBs, automotive forums, and AI-assisted research. No aggregated owner-report counts available for this vehicle yet.