P0422 code, CAT below effeciency
Thread Starter
TOTM 8/2019
Joined: Aug 2015
Posts: 1,831
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From: NJ
P0422 code, CAT below effeciency
Got this on a 2011 GMC terrain.
I figure it has to be the o2 sensor or the CAT, anything else?
1)I changed the after CAT 02 sensor, the code came back a few days later.
Anything else to do/check before I bring this to the dealer for a new cat?
I figure it has to be the o2 sensor or the CAT, anything else?
1)I changed the after CAT 02 sensor, the code came back a few days later.
Anything else to do/check before I bring this to the dealer for a new cat?