2002 Chevy Camaro P0420 Code Reappears After Catalytic Converter Replacement
I own a 2002 Chevrolet Camaro and recently encountered the P0420 diagnostic trouble code again. Last year, I was advised to replace the catalytic converter, which I did — after the replacement, my vehicle passed emissions inspection. This year, the same P0420 code has reappeared. I already replaced the rear oxygen sensor, but the code persists even after driving the car under normal conditions. Any insights into what might be causing this recurring issue?
I'm wondering where the catalytic converter was sourced — if it was a low-cost unit from a place like Arizona or similar, it's surprising it lasted only one year. A high-quality replacement might be needed to ensure long-term reliability and proper emissions performance.