stft

  1. D

    O2 Sensor No Voltage Reading / STFT Stuck at 99.2%

    Hey everyone. I’m having a little bit of trouble finding information on this particular issue. I purchased a car from an area where emissions inspections were not required. It had a tune on it that turned off the rear O2 sensors and it had an off-road H pipe, along with long tube headers. I...

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