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 …
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.
2019 Chevy Traverse with P0420 Code but with No Check...
Mar 16, 2023 · For what it's worth, my 2019 Traverse Redline had an exhaust leak with a P0420 caused by a leaking flex pipe attached to the muffler assembly. Original Concern: Exhaust …
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. …
P0420 Code on 2021 Chevy Silverado? Expert Troubleshooting Guide
The Chevy Mechanic can help with your P0420 Code O2 sensor issue on your 2021 Chevy Silverado. And, how would you like to connect with the Mechanic - phone call or online chat?
Intermittent P0420 Code & Battery Sensor Issues - 2015 Chevy …
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 …
2014 with code P0420 - Traverse Forum
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 …
2021 Traverse check engine light (P0420 code)
Nov 2, 2023 · Ran a check today and I'm getting one code - P0420 Catalytic converter system, bank 1 - efficiency below threshold. Status: Confirmed. I briefly looked online and came across …
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 …
Codes P0420, P0430 and P0497 - Traverse Forum
Jun 7, 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 …