Quote:
Originally Posted by BirdTRD
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
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I have the pcv hose connected to the intake on the nipple next to the air filter. I suspected a dirty of faulty maf but Ive already cleaned it and I haven't had the chance to trade with another frs/brz on my lot. ive currently chased down and patched up all suspected exhaust leak areas. no current misfires. There is a possibility that the o2 is bad but everything was working 100% prior to the turbo kit install which is wahy I'm leaning away from faulty sensors.