# P0420 on the 2017 Subaru Crosstrek

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

- [10246083](https://open.wenmarpro.com/bulletins/10246083), 2023-12-05: This Service Information Bulletin announces diagnostic service procedures to be followed when DTC P0420 \(Catalyst System Efficiency Below Threshold Bank 1\) is detected by the Engine Control Module \(ECM\).
- [10244906](https://open.wenmarpro.com/bulletins/10244906), 2023-11-06: This Service Information Bulletin announces diagnostic service procedures to be followed when DTC P0420 \(Catalyst System Efficiency Below Threshold Bank 1\) is detected by the Engine Control Module \(ECM\). If DTC P0420 is found to be stored in the ECM, follow the diagnostic procedures outlined below.