P0174 on Jeep
System Too Lean (Bank 2)
P0174 on Jeep vehicles indicates system too lean (bank 2). Au7o has documented this code across 7 Jeep models — most commonly on Cherokee, Compass, Grand Wagoneer. P0174 means the engine computer detected that the air-fuel mixture on Bank 2 (the side of the engine with cylinder 2) 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. Typical repair costs on Jeep range from $20 to $8,500, depending on the specific model and root cause.
Common Causes of P0174
- •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
P0174 on Jeep by Model
Jeep Cherokee(1 issue)
- Excessive Oil Consumption (2.4L Tigershark)2014-2019
The 2.4L Tigershark MultiAir engine suffers from defective piston rings allowing oil to burn in combustion chamber. Owners report consuming 1 quart per 1,000 miles. Engine can stall when oil falls below 3.5 quarts without warning light.
Jeep Compass(1 issue)
- 2.4L Tigershark Oil Pump Failure / Engine Stalling2017-2022
The 2.4L Tigershark engine may experience oil pump failure where insufficient oil pressure causes the engine to stall while driving. NHTSA Recall 17V-670 (October 2017) addressed oil pumps that would not deliver adequate pressure. The engine uses hydraulic valve actuators that rely on oil pressure, so low oil starves the valvetrain and causes sudden stalling. Excessive oil consumption between changes exacerbates the problem.
Jeep Grand Wagoneer(1 issue)
- Fuel system fault / stalling or no-start related to low-pressure fuel pump module2022-2024
NHTSA complaints and owner reports describe intermittent stalling, extended crank, or no-start events on Grand Wagoneer that are consistent with low fuel pressure delivery issues. Some cases point to in-tank fuel pump module performance problems or electrical supply/connectivity issues causing pressure drop under load.
Jeep Liberty(1 issue)
- 3.7L V6 Exhaust Manifold Crack / Valve Cover Oil Leaks2002-2012
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. TSB 09-001-10 addressed valve cover oil leaks. Head gasket failures have also been reported on higher-mileage engines.
Jeep Patriot(1 issue)
- 2.4L Engine Excessive Oil Consumption2007-2017
The 2.4L World engine in the Patriot can consume oil at an excessive rate, often exceeding 1 quart every 2,000-3,000 miles. The issue is caused by worn piston rings, valve seals, and the PCV system. If oil level drops too low between changes, it can cause engine bearing damage and eventual failure. The problem is more pronounced on higher-mileage engines.
Jeep Renegade(1 issue)
- 2.4L Tigershark Excessive Oil Consumption2015-2020
The 2.4L Tigershark MultiAir engine consumes oil at an abnormal rate, sometimes exceeding 1 quart per 1,000-2,000 miles. The MultiAir valve actuation system uses engine oil to operate the intake valves, and the system can develop internal leaks. Worn piston rings and valve seals also contribute. If oil level drops too low, the engine may stall or suffer catastrophic damage.
Jeep Wrangler(1 issue)
- Pentastar V6 Oil Consumption2012-2018
The 3.6L Pentastar V6 can consume oil at a rate higher than expected, sometimes requiring oil top-ups between changes. This is often related to piston ring design or valve guide seals. Chrysler considers up to 1 quart per 2,000 miles as within normal range.
Looking for P0174 on a different make?
View P0174 across all makes →Frequently Asked Questions
What does P0174 mean on 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 with cylinder 2) 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 specifically, this code is documented across 7 models.
What causes P0174 on Jeep vehicles?▼
Common causes on Jeep: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0174 on a Jeep?▼
Repair costs on Jeep range from $20 to $8,500, depending on the specific model and root cause.
Which Jeep models have P0174 documented?▼
Au7o has documented P0174 on 7 Jeep models: Cherokee, Compass, Grand Wagoneer, Liberty, Patriot, Renegade, Wrangler.