Subaru Forester Owners Forum - View Single Post - ('09-'13) Check engine light? - P0171 - Updated!
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post #5 of (permalink) Old 05-20-2019, 11:14 AM
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2.5x_sleeper's Avatar
Join Date: Aug 2007
Location: Newberg, OR
Posts: 34,774
Car Year: 2007
Car Model: Forester Sports XT
Transmission: 4EAT
@Ron G how did you decide it was a bad MAF?

P0171 SUBARU - System Too Lean Bank 1
Possible causes:
• Intake air leaks
• Faulty front heated oxygen sensor
• Ignition misfiring
• Faulty fuel injectors
• Exhaust gas leaks
• Incorrect fuel pressure
• Lack of fuel
• Faulty Mass Air Flow (MAF) sensor
• Incorrect Positive Crankcase Ventilation (PCV) hose connection

['07 FSXT MODding Journal] ['03 X MODding Journal]

'07 FSXT - COBB Surgeline dyno stock Protune - Stage 1+
'03 X +AVO turbo kit = XT (son's)
'95 Neon Sport
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