Service bulletins for the 2003 Honda Civic
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.
320 on file from NHTSA, as of 2026-10-19.
About P0420 on the 2003 Honda Civic: what the code means, and the bulletins and recalls about the same components.
By type
By component
By trouble code
Only bulletins with trouble code: P0420 are shown. Show all
| 1204 | 2005-12-15. Service bulletin. ENGINE AND ENGINE COOLING. DIAGNOSTIC TROUBLE CODE P0420 AND P1420 REPAIRS. *TT |
|---|---|
| 05028 | 2005-11-15. Service bulletin. ELECTRICAL SYSTEM. PRODUCT UPDATE: ECM UPDATE TO PREVENT CATALYST DTC P0420 AND/OR VPS DTC P1021, MCM UPDATE TO CURRENT SPECIFICATIONS. *TT |
| 01012005 | 2005-05-09. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION. REPLACE THE CORRECT THREE WAY CATALYTIC CONVERTER FOR DTC P0420 P01420 P2000. *EH |
| 113004 | 2005-02-01. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. DIAGNOSTIC TROUBLE CODE P0420 AND DATA RECORDER INSTALLATION. INVESTIGATION OF 2001-2003 CIVICS WITH THE MALFUNCTION INDICATOR LIGHT (MIL) ON AND DIAGNOSTIC TROUBLE CODE (DTC) P0420 STORED. *NM |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.