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FYI - I installed a home made MIL light eliminator (instructions found on WEB) but after 4 restarts and drives the CEL came back on. Guess I either live with the light being on or look for a pricey converter replacement.
Original code was 0420, worn out cat. Pulled O2 sensor and ran the bench check using a propane torch and the voltage seemed OK. Haven't checked to find out out what the new code is with the MIL eliminator installed. Need to make a trip to Autozone.
P0420 Catalyst System Efficiency Below Threshold (Bank 1)
Yeah, that code normally indicates a bad cat. Your MIL should work just fine if you have a good O2 sensor. Where did you get your MIL? What is the new code?