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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1987 Jeep YJ 403hp sbc 653hp on NOS
1998 Chev Z71
2007 Chev Trailblazer SS
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