Ford Focus Forum, Ford Focus ST Forum - View Single Post - CEL P0171 (BANK 1) help
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Old 01-23-2013, 11:05 PM   #4
Squareleft
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the MAF sensor can be a huge contributor to a p0171. more common than most causes.
Other than a vacuum leak.
As far as the oil light and ticking id say take this thing back to wherever it was installed. sounds like a real HACK install.
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