# P0420 on the 2003 Honda Accord

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

- [10014203](https://open.wenmarpro.com/bulletins/10014203), 2005-04-29: DIAGNOSTIC TROUBLE CODE P0420 AND/OR P0430, CATALYST EFFICIENCY \(V6\). \*NM
- [10014141](https://open.wenmarpro.com/bulletins/10014141), 2005-04-28: UPDATE ECM/PCM FOR DIAGNOSTIC TROUBLE CODE P0420, CATALYST BELOW THRESHOLD. \*NM
- [10004706](https://open.wenmarpro.com/bulletins/10004706), 2004-01-02: MALFUNCTION INDICATOR LAMP COMES ON WITH DIAGNOSTIC TROUBLE CODE \(DTC\) P0420. \*TT