What should I need to fix.
My car has 142000 miles.
My car has an automatic transmission.
|Catalytic Converter Replacement||$279.51 - $3103.51||Get a Quote|
|Oxygen Sensor Replacement||$108.80 - $869.59||Get a Quote|
|Check Engine Light is on Inspection||$79.99 - $89.99||Get a Quote|
Hello. When you get the P0421 code, it usually means that you have a failing catalytic converter. It is very common for converters to fail on this vehicle over time. Most of the time I use a scan tool to check the output of the oxygen sensors first, as a bad sensor can cause this code. If the sensors are reading right, then the converter will need to be replaced. If you want to have the code diagnosed, a certified technician from YourMechanic can come to your car’s location to pinpoint the proper repair.