2019 Chevy Traverse with P0420 Code but with No Check...
Mar 15, 2023 · 2019 Chevy Traverse with P0420 Code but with No Check Engine Light catalyst system obd p0420 Jump to Latest 14K views 19 replies 11 participants last post by repairman54 Mar 17, 2025
Chevy P0420 Code Diagnosis and Repair Guide - JustAnswer
The P0420 code indicates the catalytic converter’s efficiency is below threshold. Start by inspecting upstream and downstream oxygen sensors for faults or contamination.
P0420 fault code with good running condition - Impala Forums
Oct 8, 2023 · 2014 2.5L with 100,000 miles showing check engine light. Showing P0420 fault code, (catalytic converter issue), but engine runs very good. No other signs of poor performance. Could …
The Dreaded P0420 - Traverse Forum
Mar 23, 2021 · Ever heard of this code? well I got hit with it a while back and it has been coming and going for sometime. Some details about my traverse.. 2010 LT AWD, 258,751 miles. same engine …
Chevy Silverado P0420 Code Causes and Fixes Explained - JustAnswer
I have a 2015 chevy Silverado with the 5.3 engine and the check engine light on with this code. P0420 catalyst system
Chevrolet Sonic P0420 Code Causes Beyond Catalytic Converter
2016 Chevrolet Sonic LT P0420 Code: Causes Beyond Catalytic Converter Sonic LT often faces oxygen sensor failures and exhaust leaks triggering P0420 codes. The P0420 code indicates catalyst system …
Intermittent P0420 Code & Battery Sensor Issues - 2015 Chevy Impala LS
Jun 25, 2025 · I’m hoping you can help me resolve some ongoing issues with my 2015 Chevy Impala LS (Miles: 98,268) that have been confusing me, especially regarding the P0420 code and the battery …
2015 Chevy Sonic LT P0420 Code Catalytic Converter - JustAnswer
The P0420 code indicates low catalytic converter efficiency, often caused by a failing converter or faulty oxygen sensors. Start by inspecting upstream and downstream O2 sensors for damage or …
PO420 Code on Chevy Traverse? Expert Troubleshooting Guide
I am trying to resolve the P0420 code on a 2010 Chevy Traverse. Mechanic's Assistant: I understand that you're looking to correct the P0420 code on your 2010 Chevy Traverse, and our truck mechanic …
P0420 Catalytic Converter Code - Confusing Diagnosis
Howdy Folks, My 2012 Chevy Traverse LTZ (3.6L engine) is showing a P0420 Code now - I clear it and it comes back. This summer, I changed all the fluids, spark plugs, coils, etc. I did NOT replace the …