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Old 08-25-2019, 09:23 AM   #1
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Does this sound like a vacuum leak or bad A/F sensor?

P0171 code, running lean, o2 Sensor shows incomplete in OBD2 monitor report.

Could my catless UEL Header be causing the o2 sensor to show as incomplete? Iíve passed emissions with it before and the sheet showed that it was ready last time I did emissions. Could it be possible that my AF sensor has just gone bad?

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