# P0420 on the 2025 Cadillac XT4

The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.

Nobody has written a description of this code yet.

## Bulletins for this model year that name P0420

- [11018656](https://open.wenmarpro.com/bulletins/11018656), 2025-05-29: This Preliminary information communicates to the technician to replace the catalytic converter, pre and post oxygens sensor as an assembly. Engineering is collecting parts to determine the cause of the P0420.