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Old 10-30-2022, 11:12 AM
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Re: 2016 Chevrolet trax

Check for unmetered air ... check PCV hoses, check your intake tube, check it all. Everything from the MAF to the cylinder head. The P0171 happens because the PCM has detected a lean condition and has trimmed out. This is almost always due to unmetered air (air which enters the system behind the MAF). Vacuum leaks are a big source, but it can happen before the throttle body too.
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