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P0420 code


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bblackelk
New User

Sep 8, 2018, 1:54 PM

Post #1 of 2 (849 views)
P0420 code Sign In

I replaced the cat, and the o2 sensors, and i stall get the p0420 code in my 2013 Chevy Traverse. I am stumped as to what is causing it. I took some live data, and it says bank 1 sensor 1 is .83v and bank 1 sensor 2 is .06v
Bank 2 sensor 1 is .55 and bank 2 sensor 2 is .72v

Bank 1 is lean, and i don’t know why!!


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Sep 8, 2018, 2:19 PM

Post #2 of 2 (846 views)
Re: P0420 code Sign In

Look for an exhaust leak ahead of the cat but after the front sensor. That would introduce oxygen to the rear sensor.



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