P0171 on Jeep
System Too Lean (Bank 1)
P0171 on Jeep vehicles indicates system too lean (bank 1). Au7o has documented this code across 7 Jeep models — most commonly on Cherokee, Compass, Grand Wagoneer. This code means the engine's computer has detected that the air-fuel mixture on Bank 1 (the side of the engine with cylinder #1) is running too lean — meaning there is too much air relative to fuel. The computer watches the oxygen sensors and has had to add a large amount of extra fuel (long-term fuel trim) to try to compensate, but it has hit its correction limit. A lean condition can cause rough idle, hesitation, reduced power, and over time can run the engine hotter than normal. It usually points to either unmetered air leaking into the engine or not enough fuel being delivered. Typical repair costs on Jeep range from $20 to $8,500, depending on the specific model and root cause.
Common Causes of P0171
- •Vacuum or intake air leak (cracked hose, gasket, or PCV system)
- •Dirty or failing mass airflow (MAF) sensor
- •Weak fuel pump or restricted fuel filter
- •Clogged or dirty fuel injectors
- •Faulty or aged upstream oxygen sensor
- •Leaking intake manifold gasket
- •Low fuel pressure or failing fuel pressure regulator
- •Exhaust leak ahead of the oxygen sensor
P0171 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(2 issues)
- 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.
- Fuel Injector Leak / Fuel Smell in Engine Bay (3.0L Hurricane)2022-2024
On 3.0L Hurricane twin-turbocharged engines, direct fuel injectors have been reported to develop external fuel leaks at the injector body O-ring seals, allowing raw fuel vapor into the engine bay. The high-pressure direct injection system operates at significantly elevated pressures, and thermal cycling degrades the injector sealing rings prematurely. Owners report a strong fuel odor inside the cabin and in the engine compartment, sometimes accompanied by a visible wet spot or fuel staining on the intake manifold area.
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.
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View P0171 across all makes →Frequently Asked Questions
What does P0171 mean on Jeep?▼
P0171 stands for "System Too Lean (Bank 1)." This code means the engine's computer has detected that the air-fuel mixture on Bank 1 (the side of the engine with cylinder #1) is running too lean — meaning there is too much air relative to fuel. The computer watches the oxygen sensors and has had to add a large amount of extra fuel (long-term fuel trim) to try to compensate, but it has hit its correction limit. A lean condition can cause rough idle, hesitation, reduced power, and over time can run the engine hotter than normal. It usually points to either unmetered air leaking into the engine or not enough fuel being delivered. On Jeep specifically, this code is documented across 7 models.
What causes P0171 on Jeep vehicles?▼
Common causes on Jeep: Vacuum or intake air leak (cracked hose, gasket, or PCV system), Dirty or failing mass airflow (MAF) sensor, Weak fuel pump or restricted fuel filter, Clogged or dirty fuel injectors, Faulty or aged upstream oxygen sensor. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0171 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 P0171 documented?▼
Au7o has documented P0171 on 7 Jeep models: Cherokee, Compass, Grand Wagoneer, Liberty, Patriot, Renegade, Wrangler.