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bblackelk
New User
Sep 8, 2018, 1:54 PM
Post #1 of 2
(2723 views)
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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!!
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Hammer Time
Ultimate Carjunky
/ Moderator
Sep 8, 2018, 2:19 PM
Post #2 of 2
(2720 views)
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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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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.
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