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b0509-05

  1. K

    OBD2 CODES

    2009 5.3L.....With no noticeable performance issues, my check engine would sometimes come on and stay on upon start up, sometimes it wouldn't. It never came on while driving. Using my recently purchased MUCAR CDE900 PRO I got the following 3 codes: P0121-00(Throttle Position Sensor)...
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