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 …

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 …

The P0420 code indicates the catalytic converter’s efficiency is below threshold. Start by inspecting upstream and downstream oxygen sensors for faults or contamination.

Mar 16, 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

The P0420 code indicates low catalytic converter efficiency, often triggered by a faulty downstream O2 sensor. Inspect the oxygen sensor wiring and connectors for damage or corrosion.

Customer: P0420 code Chevrolet Mechanic's Assistant: I understand you're dealing with a P0420 code on your Chevrolet. That indicates an issue with the catalytic converter's efficiency. Could you share …

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 …

Nov 5, 2021 · P0420 Catalyst System Efficiency Below Threshold How to diagnose, repair, and info on symptoms and causes of a P0420 engine code which means the catalytic converter is no longer …

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 …

2014 Chevy Equinox P0420 Code: Catalyst System Low Efficiency Fix Equinox often faces exhaust leaks causing O2 sensor damage and catalytic converter efficiency loss. A loose front exhaust pipe …