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Po135 help asap

This is a discussion on Po135 help asap within the General Help forums, part of the LSx Technical Help Section category; SES popped back on and now its throwing PO135. I scaned it and it read 02 Heater Circuit Malfunction. (Bank ...

  1. #1
    Member WS6ICK2K's Avatar
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    Po135 help asap

    SES popped back on and now its throwing PO135. I scaned it and it read 02 Heater Circuit Malfunction. (Bank 1 Sensor 1.) I have LTs with ORY and have just recently been mail order tuned by Frost.

    Any help? I figured the tune would take care of it, but apparently not. The inspection has already ran out. So I need to get this fixed ASAP. Any suggestions?

  2. #2
    Member 346ci's Avatar
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    1998 Z-28

    More than likely you have an O2 sensor failure, however it could be a poor connection or wiring concern. Do you have access to a scanner? If so you can narrow it down fairly easy.

    Your tune just eliminated your post cat sensors and stopped any cat codes from tripping, however your car still uses the front O2's as they did before your LT's

  3. #3
    Senior Member 1MileCrash's Avatar
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    agreed with 346...check your connection and wiring and if that's in order the sensor itself is probably bad.

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