# P0420 on the 2003 Toyota Corolla

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

- [10010314](https://open.wenmarpro.com/bulletins/10010314), 2004-11-15: MALFUNCTION INDICATOR LAMP ON WITH DIAGNOSTIC TROUBLE CODE P0420. \*TT UPDATE. \*TT
- [633889](https://open.wenmarpro.com/bulletins/633889), 2002-09-26: MALFUNCTION INIDICATOR LIGHT ON CONDITION WITH DIAGNOSTIC TROUBLE CODE P0136 AND P0420 STORED IN THE ENGINE CONTROL MODULE \(ECM\). \*TT