P0053, now P0171 and P0174 - Hummer Forums by Elcova

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P0053, now P0171 and P0174

09-15-2012, 04:16 AM

HUMTECH

Hummer Authority

Join Date: Sep 2003

Location: Canada

Posts: 1,251

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Re: P0053, now P0171 and P0174

The o2 heater code you had would have had nothing to do with exhaust gas readings, code sets for a faulty o2 heater only. If you replaced both pre cat sensors and are now getting lean codes i would suspect the new sensors. Put the old one back in bank 2 and clear codes. If you set a lean code on bank 1 then you have to blame the new sensors

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1998 Chev Z71
2007 Chev Trailblazer SS

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