P0420 DTC, MIL On, have a generic ?
01-07-2012, 10:26 PM
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P0420 DTC, MIL On, have a generic ? I pulled up P0420 on the ethos the other day, catalyst left bank below threshold, the MIL was on for a couple weeks, then it was gone. I know the PCM will adjust STFT and LTFT to compensate for an unmetered leak if not to excessive, my question to LS1TECH users is, were there any TSB's or anything for a 2002 Camaro Z28 for something revelant to my issue. I can't access GM SI because I work for Ford, unfortunately. Thanks.
01-08-2012, 01:55 PM
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If your car was an early '02 build, then it will have passed the 10 year coverage mark. If so, then GM will not cover this repair under the extended warranty.
That code will have no effect on STFT nor LTFT. It is merely telling you that the cats are not scrubbing the exhaust as well as they should be. This is really only a concern if you have to pass a sniffer test, or an OBD scan test and don't have O2 sims or tuning software available to shut off the SES light.
That code will have no effect on STFT nor LTFT. It is merely telling you that the cats are not scrubbing the exhaust as well as they should be. This is really only a concern if you have to pass a sniffer test, or an OBD scan test and don't have O2 sims or tuning software available to shut off the SES light.
