The main component on your vehicle responsible for controlling engine emissions is the catalytic converter, commonly called the “cat”. So your car or truck is running well, but that “check engine” light is on, with a code P0420 or P0430, and related “catalyst efficiency below threshold” codes. “Check Engine Light” Codes P0420 and P0430
The main component on your vehicle responsible for controlling engine emissions is the catalytic converter, commonly called the “cat”. So your car or truck is running well, but that “check engine” light is on, with a code P0420 or P0430, and related “catalyst efficiency below threshold” codes. “Check Engine Light” Codes P0420 and P0430