RepairPal is your advocate for car care advice and guidance

Q: Do I need to use an OEM catalytic converter on this car? on 2001 Pontiac Grand Prix

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
When I bought this used car (100,000 miles)it had a new catalytic converter on it. Shortly after that I got a SES light and the dealer said the catalytic converter had failed again. He replaced it. 5000 miles later I have a SES light and had a local garage I trust scan it. They got code P0420, converter failed. They say the dealer used an aftermarket converter and you need to use an OEM unit, $586 is the friendly price for a Magnaflow unit!
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
Get a Repair Estimate
Guaranteed by certified locations nationwide. Learn more
RepairPal estimates are guaranteed at over 1,700 quality certified locations nationwide. Learn more
| |
An OE cat must be used in California legally unless the "new" cat is CARB approved. OE cat's have more catalyst material in then to neutralize harmful exhaust gasses but the bigger problem is what has anyone done to address what is causing the cat to fail in the first place? Is the engine running too rich or way lean, is the head gasket failing or cat getting oil contaminated? Could it be the O2 sensors which monitor cat converter efficiency are bad?
The car runs great, looses no coolant, does not use oil, and does not appear to run rich. I will try getting the 02 sensors checked.
Didn't find what you were looking for?