P0174 on Jeep: How to Diagnose & Fix
System Too Lean (Bank 2)
2 Jeep models · 2 documented issues · $100-$2,500 repair
P0174 on Jeep by model: symptoms, diagnosis and fix
The 3.7L PowerTech V6 engine suffers from two common issues: cracked exhaust manifolds (causing ticking noise and exhaust leak) and valve cover gasket oil leaks. The cast iron exhaust manifolds develop stress cracks due to thermal cycling, with the passenger side being more common. Head gasket failures have also been reported on higher-mileage engines.
Common Symptoms
- Ticking noise from engine on cold start
- Exhaust smell in cabin
- Oil leak on valve covers
- Oil spots on driveway
- Reduced fuel economy
- Check engine light for exhaust leak codes
How to Fix
For exhaust manifold: Replace cracked manifold with new OEM or aftermarket unit ($200-400 per side, $400-800 labor). For valve cover gaskets: Replace both gaskets using Mopar 53021828AB gasket set ($20-40 parts, $200-400 labor). Use Permatex Ultra Grey sealant on the half-moon seals. For head gasket: If coolant mixes with oil, head gasket replacement needed ($1,500-2,500).
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Genuine Mopar 53013692AB passenger/right exhaust manifoldOEMMopar 53013692AB
Right exhaust-manifold replacement after inspection proves that side is cracked or damaged Fitment/availability: 2005-2012 Jeep Liberty 3.7L, passenger/right side, superseding 53013692AA. Not the left manifold and not approved for 2002-2…
- Genuine Mopar 53013691AC driver/left exhaust manifoldOEMMopar 53013691AC
Left exhaust-manifold replacement after inspection proves that side is cracked or damaged Fitment/availability: 2005-2012 Jeep Liberty 3.7L, driver/left side catalog branch. Not the right manifold and not approved for 2002-2004 without V…
- Genuine Mopar 53013932AB passenger/right exhaust-manifold gasketOEMMopar 53013932AB
Do not substitute for the left gasket.
- Genuine Mopar 53013933AB driver/left exhaust-manifold gasketOEMMopar 53013933AB
Do not substitute for the right gasket.
- Fel-Pro VS50518R valve-cover gasket setOEMFel-Pro VS50518R
Valve-cover gasket replacement after the cleaned engine proves a cover leak on the early 3.7L branch Fitment/availability: 2002-2005 Jeep Liberty 3.7L listing. Confirm exact cover material, included grommets and VIN because 2005 overlaps…
- Fel-Pro VS50652R valve-cover gasket setOEMFel-Pro VS50652R
Both-cover gasket replacement after the cleaned engine proves a cover leak on the later plastic-cover branch Fitment/availability: 2005-2012 Jeep Liberty 3.7L with plastic valve covers and included grommets. Confirm exact cover material/…
- Genuine Mopar 53020989AB 3.7L cylinder-head gasketOEMMopar 53020989AB
Confirm side, full gasket/bolt req
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Owner tips & cautions
- TipThe ticking on cold start that goes away when warm is almost always a cracked exhaust manifold - not lifter noise
Sources for this issue (3)
FCA bulletin 09-019-23 covers 2019–2021 WK Grand Cherokees with the 5.7L HEMI (sales codes EZH or EZC) where the owner describes a ticking noise from the exhaust manifold area when the engine is cold. The bulletin repair is to visually confirm a cracked exhaust manifold - not a casting parting line or fin - and replace the cracked manifold(s) with an updated kit. Noise alone does not identify the failed component.
Common Symptoms
- Ticking noise from the exhaust manifold area when the engine is cold
- Visible crack in an exhaust manifold on inspection
How to Fix
Have the leak and noise source established before ordering parts. Repair confirmed damaged hardware or sealing surfaces using the exact vehicle service procedure; the method for removing broken fasteners depends on the damage and access. For a vehicle and confirmed manifold crack covered by 09-019-23, replace only the affected cracked manifold(s) using every component of the specified kit, including its gasket, fasteners, heat shield and tie bar. Follow the specified fastener positions rather than converting all locations to generic studs.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Genuine Mopar updated left exhaust-manifold kitOEMMopar 68591586AA
Complete FCA bulletin repair after the left 5.7L manifold is visually confirmed cracked Fitment/availability: 68591586AA is the left WK/WD/WL kit named by TSB 09-019-23. Confirm VIN, EZH/EZC engine, 2019-2022 bulletin scope, side and sea…
- Genuine Mopar updated right exhaust-manifold kitOEMMopar 68591591AA
Complete FCA bulletin repair after the right 5.7L manifold is visually confirmed cracked Fitment/availability: 68591591AA is the right WK/WD/WL kit named by TSB 09-019-23. Confirm VIN, EZH/EZC engine, 2019-2022 bulletin scope, side and c…
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
- WarningA cold tick alone does not establish a cracked manifold or broken fastener. Match the confirmed damage to the applicable repair procedure.
- TipFor the confirmed-crack repair under 09-019-23, use the complete specified kit and correct fastener positions; the right-front fastener differs from the others.
Sources for this issue (1)
P0174 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0174 mean on a Jeep?
P0174 stands for "System Too Lean (Bank 2)." P0174 means the engine computer detected that the air-fuel mixture on Bank 2 (the side of the engine that does not contain cylinder 1) is running too lean — too much air relative to fuel. The computer monitors this through the oxygen/air-fuel sensors and fuel trims; when it has to add a large amount of extra fuel to compensate and still can't reach the target, it flags the mixture as too lean. A lean condition can cause rough idle, hesitation, or misfires, and over time can raise combustion temperatures. Because it's Bank 2 specific, an unmetered air leak on that bank or a fuel delivery shortfall is typical. On Jeep it is documented across 2 models: Liberty, Grand Cherokee.
What are the most common causes of P0174?
The most common causes of P0174 are: Vacuum or intake air leak (hoses, gaskets, PCV), Dirty or failing mass airflow (MAF) sensor, Weak fuel pump or restricted fuel filter (low fuel pressure), Clogged or underperforming fuel injectors, Leaking intake manifold or throttle body gasket, Faulty or contaminated oxygen / air-fuel sensor, Exhaust leak upstream of the oxygen sensor, Stuck-open EGR valve. The specific cause varies by vehicle.
How much does it cost to fix P0174 on a Jeep?
Published repair estimates on Jeep range from $100 to $2,500 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.