My car has the dreaded "P0171" code. So far, I've cleaned the MAF and TB, replaced the fuel filter and number one o2 sensor, but the code still comes up. I can't find any leaks in the intake or exhaust system. The car runs great with no decrease in gas mileage or performance and no idle problems. What should I check next?
Found the leak. The duct between the air box and throttle body was cracked where it attaches to the throttle body. Bought one from a junk yard fo $20, cleared the code (disconnect the battery) and no more "P0171!!!!"
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Drives 2016 Cocoa Buick Encore 1.4L Turbo auto KL4CJDSB2GB652675
Drives 2016 Sunset Orange Trax LT1 1.4L Turbo auto 3GNCJPSB8GL142716
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