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
Progressive Liberalism: Bringing you new ideas so wonderful, they have to include mandatory participation ......
Originally Posted by Ronald W. Reagan
Government is not the solution to our problem; Government is the problem.