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Re: Possibly stupid question...non-monitored downstream cats
Posted to Emissions Forum on 12/14/2018

There is an exhaust shop in my area that deletes the secondary/post cats. that are after the rear O2 sensor.

On Toyota's I have had more trouble with the rear O2 sensors than the AFR sensors. Many times the P0420 MIL that would make you think the cat. needs ... Login to read more.