Service bulletins for the 2003 Toyota Corolla
A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.
153 on file from NHTSA, as of 2026-10-19.
About P0420 on the 2003 Toyota Corolla: what the code means, and the bulletins and recalls about the same components.
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Only bulletins with trouble code: P0420 are shown. Show all
| 02804 | 2004-11-15. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. MALFUNCTION INDICATOR LAMP ON WITH DIAGNOSTIC TROUBLE CODE P0420. *TT UPDATE. *TT |
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| 01102 | 2002-09-26. Service bulletin. UNKNOWN OR OTHER. MALFUNCTION INIDICATOR LIGHT ON CONDITION WITH DIAGNOSTIC TROUBLE CODE P0136 AND P0420 STORED IN THE ENGINE CONTROL MODULE (ECM). *TT |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.