Diagnosing the error code P0420 on a Chevy Equinox (2011)

[@DM-mm7rs]

Great video. I have a few questions the 02 readings on your video was the engine cold or normal temp? Also when you accelerate what should the readings look like.

[@coreyhortonps4159]

Man im having hell with min stuck in power reduce mode iv changed almost everything but the hi pressure pump and foot pedal

[@wickedwrenchgarage]

What codes do you have

[@Papichulonyc]

So witch is good ? the one going up and down or the steady ?

[@wickedwrenchgarage]

Downstream O2’s you want high and steady

[@Euphoria589]

Thanks for the video… so is it downstream or up stream

[@OrangeSkeleton1]

Which cat was replaced? The front or rear?

[@wickedwrenchgarage]

Front