P0171 on a 2022 Jeep Wrangler

P0171 means the engine computer is adding more fuel than normal on bank 1 because it sees too much air or not enough fuel.

Not your vehicle? See general P0171 info.

Most common causes on the 2022 Jeep Wrangler

Ranked from 371 NHTSA owner complaints filed for this vehicle.

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1
Fuel-delivery fault triggering 'Performance Limited - Service Fuel System' warnings
Medium severity
Two owners separately reported a high-pressure fuel system fault message during deceleration/cruise that the dealer could not fully diagnose, consistent with a fuel-delivery irregularity that can pull the mixture lean.
Reported in 2 NHTSA complaints
2
Failed fuel injector / high-pressure fuel pump
High severity
One owner had a fuel injector and high-pressure fuel pump failure confirmed on this same platform, which can starve a cylinder of fuel and skew fuel trims lean.
Reported in 1 NHTSA complaint
Parts:fuel injector high pressure fuel pump
3
Vacuum or intake air leak
Medium severity
Unmetered air entering after the MAF sensor is the single most common cause of a P0171 on any turbocharged engine.
Common cause
4
Dirty or failing MAF sensor
Low severity
A contaminated or drifting MAF under-reports intake air volume, causing the ECM to under-fuel and trip a lean code.
Common cause
Parts:mass airflow sensor
5
Weak fuel pump or clogged fuel filter
Medium severity
Reduced fuel delivery under load produces lean-trim symptoms similar to those reported above even without a hard fault code.
Common cause
Parts:fuel pump fuel filter
6
Intake manifold or vacuum-hose leak
Medium severity
A leaking intake gasket or split vacuum hose is a common unmetered-air entry point that directly causes a lean code.
Common cause

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These causes are aggregated from NHTSA owner complaints and general repair knowledge — this is not a diagnosis. P0171 on your car still needs shop confirmation before any repair.

Common symptoms

Check engine light
Rough idle
Hesitation
Surging idle
Poor fuel economy

What to check before replacing parts

Review short- and long-term fuel trims on bank 1

Look for: High positive trims (commonly worse at idle, improving with RPM) mean the computer is adding fuel to compensate for excess air or insufficient fuel — that pattern is this code's fingerprint.

Smoke-test the intake

Look for: Smoke escaping (or a hiss you can hear) at intake boots, gaskets, or vacuum hose connections confirms unmetered air is entering after the MAF sensor, which is the most common cause of a lean code.

Inspect the PCV hoses and valve

Look for: A cracked, split, or disconnected PCV hose, or a PCV valve stuck open, draws in extra unmetered air the same way a vacuum leak does.

Clean and test the MAF sensor

Look for: Visible dirt or oil film on the sensor element, or a grams/second reading that doesn't track expected airflow for RPM, means the MAF is under-reporting air and causing the computer to under-fuel.

Verify fuel pressure

Look for: Pressure below spec (weak pump, clogged filter, failing regulator) starves the engine of fuel and produces the same lean trim pattern as a vacuum leak — rule it out before chasing leaks.

Rather have a pro handle it? Find a vetted local mechanic.

Matching symptoms

Car Runs Rough