|
I had P0171's and after chasing down and fixing my exhaust leaks, it turned out to be a vacuum leak. Verify the integrity of those two systems first.
P0171 SUBARU - System Too Lean Bank 1 Possible causes:
Intake air leaks (Vacuum leak)
Faulty front heated oxygen sensor
Ignition misfiring
Faulty fuel injectors
Exhaust gas leaks (before or at O2 sensor)
Incorrect fuel pressure
Lack of fuel
Faulty Mass Air Flow (MAF) sensor
Incorrect Positive Crankcase Ventilation (PCV) hose connection
|