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02-24-2019, 07:36 PM
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#9 |
 Drives: 2008 Yaris 3DR Hatch MT Join Date: Dec 2018
Location: Harrisburg, PA
Posts: 80
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"Many people will replace the air fuel sensor or O2 sensor as soon as they get a bad reading, but the root cause is often a dirty or faulty mass air flow sensor or vacuum leak, thus causing the O2 or A/F sensor to read differently to compensate. Reading and analyzing fuel trims and the freeze frame data is the key to properly diagnosing P0171."
Fuel pump could be an issue also. |
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