Repair Instructions
WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification
After any repair, operate the vehicle within the Conditions for Running the DTC P0420 to verify the performance of the component: Catalytic Converter - Refer to: DTC P0420 or P0430