Main IndexAuto Repair Home Search Posts SEARCH
Who's Online WHO'S
Log in LOG

Search Auto Parts

P0420 code

  Email This Post

New User

Sep 8, 2018, 1:54 PM

Post #1 of 2 (1962 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 (1959 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.


We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

  Email This Post

Feed Button

Search for (options) Privacy Sitemap