I've had the CEL and trac off lights coming on and off ever since i had the header and cat-back system installed on my car. The diagnostics brought up this P0133 code saying the pre O2 sensor was reading too slow. Everyone said to replace the O2 sensor which i did, i also replaced the connecting harness that connects the wires from the PCM to the O2 sensor because it was melted. The lights are still on and it seems to be worse off now. The car shifts at odd times, and for the first few accelerations it surges a little. I would think that would be the throttle position sensor but it doesn't surge anymore after about a minute of driving. Any ideas? this is on a 2001 Cavalier z24


There's no pain like wrecking your first J