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p0420

  1. Bad cat

    1st Gen - Problems and Fixes
    Hi everyone, I had been strugling with my CEL for a while. I have P0420 code. I went to indy shop, they did diagnose upon doing proper checks on both sensors, and concluded that it is, as I suspected, bad cat. Now, with decent amount of certainty, I can say that cat is the problem and needs to...
  2. Catalytic Converter / O2 Sensor Malfunction...Confused!

    1st Gen - Problems and Fixes
    I have a completely aftermarket exhaust system (see below) and I have been throwing the CEL code P0420 (Catalyst System Efficiency Below Threshold {Bank 1}). I bought an OBDII reader to clear this code (usually took a week or two to reappear) and after a while I got lazy and just left it on. I...
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