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Audi · Known Issues

2001 Audi A4 Problems: 8 Known Issues

2001 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 2001 Audi A4 has 8 documented known issues, with 1 rated critical. The most serious is 1.8T oil sludge clogs pickup tube and starves engine of oil ($300-$3,500 repair). Across all issues with published estimates, repair costs range from $15 to $3,500. DIY maintenance guides at au7o.io.

In This Article

  • A4 Engine3
  • A4 Electrical3
  • A4 Suspension1
  • A4 Brakes1
  • Recalls9
  • FAQ
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In This Article

  • Engine3
  • Electrical3
  • Suspension1
  • Brakes1
  • Recalls9
  • FAQ

All 8 Known Issues

Filter:
ALL YEARS202520242023202220212020201920182017201620152014201320122011201020092008200720062005200420032002200120001999199819971996

When Issues Typically Appear

1.8T oil sludge clogs pickup tube and starves engine of oil
60K-150K
G62 Engine Coolant Temperature Sensor (black-housing) fails causing erratic temp gauge, hard cold starts and rich-running
60K-150K
Central locking vacuum pump fails: shattered graphite impeller or water-intrusion fried electronics
60K-180K
Front upper/lower control arm bushing and ball-joint failure causes clunking
70K-150K
Instrument Cluster LCD Pixel Failure and Intermittent Gauge/Warning Display Problems
70K-180K
Instrument cluster (MID) and climate control LCD pixel/segment failure
80K-200K
050K100K150K200K mi

On the 1997-2001 Audi A4 1.8T (AEB, ATW, AWM), Engine oil sludge is a well-documented issue on the longitudinally-mounted 1.8T in the B5 A4. Volkswagen of America warned 426,000 VW Passat and Audi A4 owners of an engine oil sludge problem affecting 1.8-liter turbocharged four-cylinder engines on 1998 to 2004 Passats and 1997 to 2004 A4s , and Audi offered an 8 years unlimited mileage extended warranty for the oil sludge issue provided the owner could show proof of oil change intervals. Sludge is the thickening/coking of engine oil due to heat and moisture. Turbocharged engines generate a lot of heat near the compressor turbine — the turbo shaft bearing is a mere ¼ inch away from 900° temperatures. When turbocharged engines are driven hard, oil within the turbo can heat up to a point where it begins to break down and forms solid particles, especially if an engine is shut down before the turbo can cool down. This cooked oil forms large particles which pass down into the sump and are then sucked into the pickup tube . The longitudinally mounted 1.8t engines in the B5-B6 models had a smaller oil pan than their transverse mounted cousins, making the engine more susceptible to overheating and sludge . Over time, these particulates flake off and make their way down into the oil pan, eventually clogging the oil pick-up screen. This restriction limits the flow of oil to the point where the oil pump can no longer supply the necessary amount of pressurized oil to the system , ultimately leading to turbocharger and bearing failure.

Common Symptoms

  • low oil pressure warning light
  • oil pressure light flickers at idle or low rpm
  • ticking lifter noise
  • turbo whine/failure
  • smoke from exhaust
  • engine knock

How to Fix

Audi's sludge service replaces the oil pump pickup, turbo oil feed line, crankcase vent pipes/PCV valve, reseals the oil pan, replaces the valve cover gasket, and replaces the cam tensioner if worn. Use synthetic oil that meets the VW 502 00 standard and change every 5,000 miles. Upgrade to the larger 068-115-561-B (or equivalent) oil filter, which holds more oil and catches more debris. For DIY, dropping the oil pan and cleaning the pickup screen costs ~$300 in parts; one owner had a trusted mechanic replace the oil pump pickup tube for $450 and the old tube came out plugged ; full sludge remediation at a shop runs $1,500-$3,500, and an engine replacement (which Audi sometimes performed under the TSB) is significantly more. If the pickup is already clogged, do not run engine flushes such as Seafoam — they may dislodge sludge buildup causing other problems such as plugging the turbo oil supply and killing the turbo .

Typical repair cost:$300 - $3,500

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Community Reported
High ConfidenceLast reported by owners May 2026Reviewed May 2026

On the 1996-2001 Audi A4, the original black-housing dual coolant temperature sensor (G62) mounted in the coolant flange at the back of the cylinder head develops cracks and fails internally. The temperature sensor G2 (also known as G62) for the gauge has likely failed and is relatively easy to fix; it is located in the coolant flange at the back of the cylinder head and the early square-connector style and later elongated D-shaped black connector sensors are known problematic units. When it fails the ECU sees an implausible coolant temperature, leading to cold starting difficulties at low temperatures, poor idle and acceleration during warm up as well as an erratic or dead temperature gauge.

This issue also affects: Volkswagen New Beetle, Volkswagen Passat, Audi A1

Common Symptoms

  • erratic or dead coolant temperature gauge
  • hard cold starts
  • rough idle during warm-up
  • poor fuel economy
  • rich-running condition
  • check engine light

How to Fix

Scan with VAG-COM/VCDS for fault 17664 / 16502 (P0118) and bench-test the sensor's resistance. From Bentley, the G62 test procedure: allow engine to cool to room temp (68F/20C), disconnect ECT sensor, connect multimeter to terminals 1 and 2; resistance must be 1500 to 3000 ohms — if not, replace the ECT. Replace with the updated green-top OEM sensor (part 059 919 501A) along with the retaining clip (032 121 142) and O-ring; replacing this sensor resolves running issues for many owners who are still using the original black sensor which had a high failure rate. Part is ~$25-40, DIY 30 minutes; shop labor brings total to ~$80-180.

What you need to fix it

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

  • Engine Coolant Temperature Sensor
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Typical repair cost:$30 - $180

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Community Reported
High ConfidenceLast reported by owners May 2026Reviewed May 2026

On the 1997-2005 Audi A4 1.8L turbocharged inline-4 (AEB/ATW/AWM/AMB), the 20-valve 1.8T does not drive the intake camshaft off the timing belt. The belt turns the exhaust cam, and a short chain inside the front of the cylinder head carries drive across to the intake cam through a hydraulically actuated adjuster unit. Engine oil pressure, gated by the N205 camshaft adjustment valve, pushes the adjuster piston and rotates the intake cam relative to the exhaust cam to advance intake timing off idle. The ECU commands the adjustment, then watches the Hall-effect camshaft position sensor to confirm the cam actually moved. When commanded and actual position disagree beyond the window, VAG scan tools log 17927 / P1519 — Camshaft Adjustment Bank 1: Malfunction. Ross-Tech's own wiki lists the causes as a blown fuse, a faulty N205 camshaft adjustment valve, faulty wiring or connectors to that valve, and worn chain guides inside the camshaft adjuster unit. On high-mileage 1.8T engines the failure is frequently mechanical rather than electrical: the plastic chain guides and tensioner rail inside the adjuster wear, the short chain goes slack, and the adjuster can no longer reach or hold the commanded angle. Long oil-change intervals and sludge accelerate it, because the fine screen at the base of the N205 solenoid clogs with varnish and starves the adjuster of oil pressure. Owners typically report a rattle from the front of the head for a second or two on cold start, a flat spot in mid-range pull, slightly worse fuel economy, and a check-engine light that comes and goes. Because the code often logs as sporadic, many owners clear it and drive for months. Left alone the chain can eventually skip a tooth, which throws intake and exhaust timing far enough apart to cause hard starting and heavy misfire.

Common Symptoms

  • Check engine light with stored code 17927/P1519, often sporadic
  • Brief chain rattle from the front of the cylinder head on cold start
  • Flat spot or loss of mid-range pull
  • Rough or uneven idle
  • Reduced fuel economy
  • Hard starting if the cam chain has skipped

How to Fix

Diagnose in order of cost. First read live data with a VAG-capable tool and run the output test on the N205 camshaft adjustment valve — the valve should click audibly and idle quality should change. Check the fuse feeding the valve and inspect the connector at the front of the head, which sits in an oily, heat-cycled spot and is a documented source of intermittent faults; owners have found the adjuster connector simply unplugged. If the solenoid tests good electrically, pull it and inspect the small filter screen on its nose. A screen packed with sludge is the classic cheap fix — clean or replace the valve, change the oil with the correct grade, and re-test. The solenoids can also be swapped side to side on twin-cam-bank cars to see whether the fault follows the part. If the valve and wiring are good and the code still returns, inspect the adjuster unit's chain guides for wear, as Ross-Tech advises. That is a real job: remove the timing belt, lock the cams, and pull the front of the head to replace the camshaft adjuster with its chain, guides, and tensioner as a kit. Always verify timing-belt and cam marks during reassembly, because a jumped belt presents with the same code. Since the belt has to come off anyway, do the belt, tensioner, rollers, and water pump at the same time. Expect roughly $150-250 in parts for a valve-only repair and $900-1,400 for the full adjuster and belt service at an independent VAG shop.

Typical repair cost:$150 - $1,400

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Community Reported
High ConfidenceVerifiedReviewed Sep 2026

On the 2000-2005 Audi A4, b5 and early B6 A4 models commonly suffer from failing instrument cluster displays, especially the center LCD where outside temperature, warning messages, and trip computer information become unreadable due to missing pixels. Some owners also report intermittent gauge behavior or fading displays that worsen with heat. This is a well-known age-related electronics issue documented across forums and complaint records because it affects visibility of warning information and often requires cluster repair or replacement.

This issue also affects: Audi TT, Audi A6

Common Symptoms

  • missing pixels in center display
  • faded or unreadable warning screen
  • display worse when hot
  • intermittent gauge operation
  • warning messages cannot be read

How to Fix

Confirm whether the problem is limited to the LCD ribbon/display or whether the cluster has broader internal faults. Specialist rebuilders can often repair the pixel display and restore the cluster without replacing the entire unit, while replacement clusters require immobilizer matching/coding on applicable years. Battery voltage and charging system health should also be checked because low voltage can aggravate display behavior.

Typical repair cost:$250 - $900

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Community Reported
High Confidence

On the 1997-2001 Audi A4, the pneumatic central locking pump/module is located in the right-rear corner of the trunk under the trim. The heart of the system is the central locking pump control module (CLP) located in the trunk. It's in the right rear corner of the A4 & S4. The CLP consists of a graphite rotary-vane pump driven by an electric motor that generates air pressure or vacuum that locks and unlocks the doors, trunk, & fuel door. Two common failure modes: The Audi pneumatic central locking system is plagued by several common problems as it ages. The most common problem is when the internal graphite parts of the air pump wear out and shatter. This is the result of normal use and wear. Many people have observed the locks taking longer and longer to unlock over a period of weeks or months as the pump parts are in their final stages of life. Second mode is electronics failure from water intrusion: failure of the electronics due to water intrusion into the trunk. In extreme cases the electronics failure can cause the CLP to run until it heats up and melts. Water intrusion on the A4 & S4 models is often through a faulty trunk seal or faulty right side tail light seal. A third mode is a slow leak in the plastic tubing (most common at the driver's-door hinge) that causes the pump to over-run; sustained over-run is what eventually shatters the graphite impeller.

Common Symptoms

  • doors fail to lock/unlock from key or remote
  • pump runs continuously until timeout
  • rattling sound from trunk (shattered graphite)
  • only driver's door locks/unlocks
  • burning smell from rear of trunk
  • interior lights / alarm misbehaving
  • locks taking progressively longer to actuate over weeks/months

How to Fix

Open the trunk and pull back the right-side liner — if the foam block around the pump is wet, the right tail-light seal and/or trunk seal must be fixed before any new pump will survive. Test by listening: if the motor hums but produces no pressure/vacuum at the nipples, the internal graphite vanes have shattered. If the pump runs continuously until timeout, suspect a leak in the plastic vacuum lines (common at the door-T fittings), dried hose-connector O-rings, or the pump's internal pressure-cutoff diaphragm/contacts. The pump runs until it meets pressure, or times out — a common fix is a small split in one of the tubes over a nipple, which can be cut off and patched with a piece of rubber tubing. Used CLPs run $50-150, new ~$300-500; dealer replacement totals $500-700. Module part numbers 8D0862257B/N (pre-facelift) and 8L0862257B/N (facelift) for B5 A4 — board can be swapped to retain coding, or pump motor/graphite can be transplanted from a cheap VW Passat/Jetta donor unit.

Typical repair cost:$15 - $700

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Community Reported
High ConfidenceLast reported by owners May 2026Reviewed May 2026

On the 1996-2001 Audi A4, the large red multi-function display in the center of the B5 instrument cluster (Jaeger/VDO speedometers) and the smaller climate control LCD both lose pixel rows and segments as the silver-conductive ribbon-to-LCD bond degrades with heat cycles. The common thing is the big red fading LCD in the middle, with missing lines or columns and disappearing LCD pixels (sometimes getting worse when warmed up). Drivers see missing lines/columns in the odometer, trip computer, gear selector indicator, and HVAC temperature readout — often worse when the cabin is warm. The fault is cosmetic-to-nuisance grade but can hide important warnings (oil temp, mileage).

Common Symptoms

  • missing rows/columns on red MID display
  • blank or partial HVAC temperature digits
  • fading display when interior warms up
  • unreadable odometer/trip computer
  • intermittent display flicker

How to Fix

For the instrument cluster, replace the LCD ribbon cable or full LCD module (Minitools SEPDISP09, Module Master, or Pixelfix kits, ~$30-80) — requires removing the two torx screws holding the cluster, pulling it out of the dash, and disconnecting the three connectors on the back (push purple retaining clips upwards) , then disassembly and careful soldering of a ribbon connector. The SEPDISP09 consists of an LCD display with FPC to be soldered (using tin solder) to the main board of the dashboard, and a good level of skill and soldering experience are required. For the climate control LCD, a plug-and-play LCD kit (Module Master/Circuit Solutions ~$60) installs in roughly 30 minutes. Module Master will swap out the LCD for something like $150 and takes about a week , so send-in repair services run roughly $100-200 if you prefer not to DIY.

Typical repair cost:$60 - $300

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Community Reported
High ConfidenceLast reported by owners May 2026Reviewed May 2026

On the 1996-2001 Audi A4, One of the most common suspension issues seen on Audi A4s is worn or failed control arm bushings; the bushings receive the most pressure during braking or heavy acceleration, and these forces cause the rubber to fatigue and crack . When inspecting at the inboard end where the control arm mounts to the chassis, you may see cracks, leaks or missing pieces of rubber, and at low speeds hear a clunking or creaking noise when traveling over a speed bump . On the B5 A4, both upper and lower control arms wear — owners commonly report needing one upper on one side and a lower on the other .

Common Symptoms

  • clunking or creaking over bumps and speed humps
  • metallic squeaking from front end
  • vague or wandering steering
  • uneven inside-edge tire wear
  • vibration through steering wheel

How to Fix

Raise the car using a jack, find the suspected control arm, move it manually to check for looseness, and have a friend bounce the car so you can listen for noises . Most B5 owners replace the full set of 8 front control arms ('boomerang' kit) at the same time since labor overlaps. Replacing the control arms can be done for around $200-250 in parts if you do the work yourself ; a shop replacement typically runs $800–$1,400 for the full front-end refresh. Use OEM-quality brands (Lemförder, Meyle HD, TRW) — cheap eBay arms commonly fail within 20-30k miles.

Typical repair cost:$250 - $1,400

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Community Reported
High ConfidenceLast reported by owners May 2026Reviewed May 2026

On the 1997-2001 Audi A4, audi TSB 2042048/1 applies to 1997-2001 A4 vehicles with ABS 5.3 when a scan or emissions tool cannot communicate with the vehicle and the ABS and brake warning lamps illuminate. Audi attributes the communication fault to the ABS control module interfering with the diagnostic bus and explicitly states that braking and ABS function are not affected by this communication condition. The bulletin supplies no DTC and does not establish every warning lamp as module failure.

Common Symptoms

  • Scan or emissions tool cannot communicate with the vehicle
  • ABS and brake warning lamps illuminate during the communication fault

How to Fix

Confirm ABS 5.3 equipment and reproduce the scan-communication fault. Follow Audi’s temporary control-module disconnect or fuse/ground-bond test to verify whether communication returns, then use current Audi repair information for the confirmed fault. Do not buy a rebuilt module, replace the hydraulic unit or infer loss of braking from this record alone; independently diagnose any actual braking concern.

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Manually Verified
High ConfidenceVerifiedReviewed Jul 2026
NHTSA Recalls9 recalls

AIR BAGS:FRONTAL:DRIVER SIDE:INFLATOR MODULE

Volkswagen Group of America, Inc. (Volkswagen) is recalling certain 2000-2001 Audi TT Coupe, TT Roadster, 2000-2002 A4, and S4 vehicles equipped with Non-Azide Driver Air Bag Inflators (NADI) that do not contain phase stabilized ammonium nitrate (PSAN) propellant. Due to a manufacturing issue, the NADI inflators may absorb moisture, possibly causing the air bag to deploy improperly in the event of a crash.

Campaign #21V47000023/06/2021

ENGINE AND ENGINE COOLING:ENGINE

The Gates Corporation (Gates) is recalling certain aftermarket Tru-Flow Water Pumps, part number TFW 41127, sold at certain NAPA Auto Parts and/or installed by automotive service technicians after November 1, 2013 (and manufactured August 2013 through October 2013) that have a black-colored pulley/sprocket or do not have 'US9377' stamped on the water pump housing. These service replacement parts were sold for use in model year 1999-2005 Audi A4, 2000-2006 Audi TT, 1998-2005 Volkswagen Beetle, 1999-2006 Golf, 1999-2008 and 2011-2013 Volkswagen Jetta, and 2000-2005 Volkswagen Passat. In the affected water pumps, the pulley or sprocket that turns the timing belt may develop microfractures causing the timing belt to fail.

Campaign #14E00700007/03/2014
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Frequently Asked Questions

What are the most common Audi A4 problems?

According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2001 Audi A4 has 8 documented issues. The most frequently reported are: 1.8T oil sludge clogs pickup tube and starves engine of oil, Front upper/lower control arm bushing and ball-joint failure causes clunking, G62 Engine Coolant Temperature Sensor (black-housing) fails causing erratic temp gauge, hard cold starts and rich-running. Of these, 1 is rated critical and should be addressed promptly.

Is the Audi A4 reliable?

The 2001 Audi A4 has 8 known issues compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. 1 issue is rated critical: 1.8T oil sludge clogs pickup tube and starves engine of oil. 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 Audi A4 problems?

Repair costs for known Audi A4 issues range from $15 to $3,500, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, 1.8T oil sludge clogs pickup tube and starves engine of oil, typically costs $300-$3,500 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What is the 1997-2001 Audi A4 1.8T oil sludge clogs pickup tube and starves engine of oil?

Engine oil sludge is a well-documented issue on the longitudinally-mounted 1.8T in the B5 A4. Volkswagen of America warned 426,000 VW Passat and Audi A4 owners of an engine oil sludge problem affecting 1.8-liter turbocharged four-cylinder engines on 1998 to 2004 Passats and 199… Repairs typically run $300-$3,500. Severity: high.

What is the 1996-2001 Audi A4 Front upper/lower control arm bushing and ball-joint failure causes clunking?

One of the most common suspension issues seen on Audi A4s is worn or failed control arm bushings; the bushings receive the most pressure during braking or heavy acceleration, and these forces cause the rubber to fatigue and crack . When inspecting at the inboard end where the c… Repairs typically run $250-$1,400. 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.

EXTERIOR LIGHTING

CERTAIN CK MOTORSPORTS COMBINATION HEADLIGHTS, CLEAR CORNER, BUMPER, AND SIDE MARKER LIGHTS SOLD AS REPLACEMENT LAMPS FOR USE ON THE PASSENGER VEHICLES LISTED ABOVE. SOME COMBINATION LAMPS THAT ARE NOT EQUIPPED WITH AMBER SIDE REFLECTORS FAIL TO CONFORM TO FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 108, LAMPS, REFLECTIVE DEVICES, AND ASSOCIATED EQUIPMENT.

Campaign #06E04900024/05/2006

AIR BAGS:FRONTAL:PASSENGER SIDE:INFLATOR MODULE

Volkswagen Group of America, Inc. (Volkswagen) is recalling certain model year 2004-2008 Audi A4, and 2005-2011 Audi A6 vehicles originally sold, or ever registered, in Alabama, California, Florida, Georgia, Hawaii, Louisiana, Mississippi, South Carolina, Texas, Puerto Rico, American Samoa, Guam, the Northern Mariana Islands (Saipan), and the U.S. Virgin Islands, or "Zone A." Additionally, unless included in "Zone A" above, Volkswagen is recalling certain model year 2004-2008 Audi A4, and 2005-2008 Audi A6 vehicles originally sold, or ever registered, in Arizona, Arkansas, Delaware, District of Columbia, Illinois, Indiana, Kansas, Kentucky, Maryland, Missouri, Nebraska, Nevada, New Jersey, New Mexico, North Carolina, Ohio, Oklahoma, Pennsylvania, Tennessee, Virginia, and West Virginia, or "Zone B." Lastly, unless included in "Zone A" or "Zone B" above, Volkswagen is recalling model year 2004 Audi A4 vehicles originally sold, or registered, in Alaska, Colorado, Connecticut, Idaho, Iowa, Maine, Massachusetts, Michigan, Minnesota, Montana, New Hampshire, New York, North Dakota, Oregon, Rhode Island, South Dakota, Utah, Vermont, Washington, Wisconsin, and Wyoming. These vehicles are equipped with certain air bag inflators assembled as part of the passenger frontal air bag modules, and used as original equipment or replacement equipment. In the event of a crash necessitating deployment of the front air bags, these inflators may rupture due to propellant degradation occurring after long-term exposure to absolute humidity and temperature cycling.

Campaign #16V38200001/06/2016

EXTERIOR LIGHTING:HEADLIGHTS

ON CERTAIN PASSENGER VEHICLES, THERE IS A POSSIBILITY OF XENON HEADLAMP COATING DEGRADATION OVER TIME. THE LUMINOUS TRANSMITTANCE OF THE HEADLAMP MAY DECREASE OVER A PERIOD OF TIME.

Campaign #05V09600015/03/2005

+ 4 more recalls. Check all on NHTSA.gov

Enter your VIN at NHTSA.gov to check recalls specific to your vehicle.

What is the 1996-2001 Audi A4 G62 Engine Coolant Temperature Sensor (black-housing) fails causing erratic temp gauge, hard cold starts and rich-running?

The original black-housing dual coolant temperature sensor (G62) mounted in the coolant flange at the back of the cylinder head develops cracks and fails internally. The temperature sensor G2 (also known as G62) for the gauge has likely failed and is relatively easy to fix; it i… Repairs typically run $30-$180. Severity: medium.

What is the 2000-2005 Audi A4 Instrument Cluster LCD Pixel Failure and Intermittent Gauge/Warning Display Problems?

B5 and early B6 A4 models commonly suffer from failing instrument cluster displays, especially the center LCD where outside temperature, warning messages, and trip computer information become unreadable due to missing pixels. Some owners also report intermittent gauge behavior or… Repairs typically run $250-$900. Severity: medium.

What is the 1997-2001 Audi A4 1997-2001 A4 ABS 5.3 Scan-Communication Fault - TSB 2042048/1?

Audi TSB 2042048/1 applies to 1997-2001 A4 vehicles with ABS 5.3 when a scan or emissions tool cannot communicate with the vehicle and the ABS and brake warning lamps illuminate. Audi attributes the communication fault to the ABS control module interfering with the diagnostic bus… Severity: medium.

What is the 1997-2005 Audi A4 Worn Camshaft Adjuster Chain Guides Stop Intake Cam From Advancing?

The 20-valve 1.8T does not drive the intake camshaft off the timing belt. The belt turns the exhaust cam, and a short chain inside the front of the cylinder head carries drive across to the intake cam through a hydraulically actuated adjuster unit. Engine oil pressure, gated by t… Repairs typically run $150-$1,400. Severity: medium.

What is the 1997-2001 Audi A4 Central locking vacuum pump fails: shattered graphite impeller or water-intrusion fried electronics?

The pneumatic central locking pump/module is located in the right-rear corner of the trunk under the trim. The heart of the system is the central locking pump control module (CLP) located in the trunk. It's in the right rear corner of the A4 & S4. The CLP consists of a graphite… Repairs typically run $15-$700. Severity: low.

What is the 1996-2001 Audi A4 Instrument cluster (MID) and climate control LCD pixel/segment failure?

The large red multi-function display in the center of the B5 instrument cluster (Jaeger/VDO speedometers) and the smaller climate control LCD both lose pixel rows and segments as the silver-conductive ribbon-to-LCD bond degrades with heat cycles. The common thing is the big red… Repairs typically run $60-$300. Severity: low.