P0420 - Its not the Cat or 02 sensors - GMC Terrain, Equinox, and …
Jun 4, 2018 · P0420 Permanent Code is the ECU saying the "second" O2 sensor (s) after your first catalytic converter (s) are not sending the signals the computer expects in relation to the …
P0420 Code - GMC Acadia Forum
May 11, 2015 · Just purchased a 2009 GMC Acadia SLT1 on 5-08-15, drives great and is clean. On my way to work today 05-11-15 I see that the engine light is on and no idea why. I did get …
P0420 code - GMC Acadia Forum
Mar 6, 2020 · Please help!!! I have replaced the catalytic converter & both 02 censors, but I still have the engine light on and the P0420 code. It won't pass emissions & I've already spent a lot …
Error Code P0420 (Catalytic Converter) - GMC Acadia Forum
Nov 28, 2023 · There are many reasons for a P0420. Sounds like you need a proper diagnosis. Damaged muffler or leaks in the muffler. Damaged exhaust manifold or leaks in the exhaust …
Code P0420 - GMC Acadia Forum
Jul 24, 2018 · Wouldn’t that pull a different code? Yes. You'd likely see a P0740 or P0741 code if it was a problem with the torque converter clutch circuit and/or solenoid. Is someone confusing …
P0420 & P0430 codes - GMC Acadia Forum
Jan 11, 2023 · Hello all, I know I usually ask some bogus questions here but I really do need some assistance. My Acadia has been throwing P0430 and P0420 codes for a while now and I …
P0420 code and options - GMC Terrain, Equinox, and SRX Forum
Feb 8, 2016 · So last night my check engine light came on. I went to AutoZone and they scanned it. Came back with a P0420 code, which says the Bank 1 catalyst system efficiency was below …
P0420 Check engine light code - anybody else have it? - GMC …
Dec 9, 2012 · We have been experiencing recurring check engine lights on our 2008 Acadia. When I call Onstar to have them run the onboard diagnostics, it always comes up as the …
P0420 Code - GMC Terrain, Equinox, and SRX Forum
May 7, 2023 · 17 Terrain 3.6 92K. Check engine light came on today. Scanned it and it came op P0420 code. Any ideas what it could be?
P0420 | GMC Terrain, Equinox, and SRX Forum
Jun 11, 2018 · P0420 Permanent Code is the ECU saying the "second" O2 sensor (s) after your first catalytic converter (s) are not sending the signals the computer expects in relation to the …