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P0171 and p0121 codes

This is a discussion on P0171 and p0121 codes within the General Help forums, part of the LSx Technical Help Section category; Hey, I was wondering what you guys thought about this. I have a 2000 Z28. Has F13 cam, Lid, K&N, ...

  1. #1
    Junior Member LS1BL's Avatar
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    P0171 and p0121 codes

    Hey, I was wondering what you guys thought about this. I have a 2000 Z28. Has F13 cam, Lid, K&N, Long tube Headers, Off road X, and bullets dumped. It is throwing a p0171 (system too lean Bank 1) and p0121 (Throttle pedal position sensor/switch A circuit range performance problem). Where do you guys think I should start looking?

    Any help is much appreciated ,

    Thanks,
    Bryon

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    Junior Member LS1BL's Avatar
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    O and the code does not stay on, it goes on and off.

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    Moderator Cutlass's Avatar
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    1999 Formula WS6 M6-sold
    2001 Silverado Z71

    could be as simple as needing a new TPS and an O2 sensor.

  4. #4
    Junior Member LS1BL's Avatar
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    I replaced the TPS sensor already and reset the code and it still came back on

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