The most common causes would be a failing O2 sensor, or a leaky exhaust manifold.
If the O2 sensor is the original, replace it. Check the exhaust manifold for cracks, if cracked, replace it. Cracked manifolds are very common.
P0171 JEEP - Fuel System 1/1 Lean
- Check Engine Light ON
- Excessive Fuel Consumption
- Intake air leaks
- Faulty front heated oxygen sensor
- Ignition misfiring
- Faulty fuel injectors
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Faulty (MAP) sensor
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