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Service bulletins for the 2003 Kia Optima

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.

22 on file from NHTSA, as of 2026-10-19.

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By component

By trouble code

Only bulletins with component: Engine are shown. Show all

Bulletins, newest first
PS5392018-04-16. Service bulletin. ENGINE AND ENGINE COOLING. PITSTOP - ENGINE COMPONENT RE-USE GUIDELINES - In general, parts and components removed during engine repairs should be considered serviceable, and should be thoroughly cleaned and transferred to the new engine.
TSB-0682010-10-29. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. KIA: INTERMITTENT MIL ON WITH NO FAULT CODE STORED; INFORMATION ABOUT DTC P1330. PROVIDES INFORMATION RELATING TO CERTAIN VEHICLES. IN AFFECTED VEHICLES AN INTERMITTENT SHORT TO GROUND IN A CIRCUIT ONLY INTENDED FOR TESTING PURPOSES MAY CAUSE THE MIL TO ILLUMINATE AND A DTC P1330 (SPARK TIMING ADJUST) TO BE STORED. *PE
TSB-0442010-08-18. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE; ELECTRICAL SYSTEM:SOFTWARE. KIA: ECM UPGRADE WITH TP SENSOR REPLACEMENT-MIL ON WITH DTC P2135/P0638. INFORMATION RELATED TO ECM SOFTWARE AND TP SENSOR UPGRADE ON SOME VEHICLES WITH 2.7L ENGINES WHICH MAY EXPERIENCE A MALFUNCTION INDICATOR LAMP (MIL) ILLUMINATED WITH THE ELECTRONIC THROTTLE CONTROL (ETC) SYSTEM RELATED DTC P2135 OR P0638 OR P2A00 OR P2A03. *PE
0382008-01-16. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. THIS BULLETIN PROVIDES INFORMATION RELATING TO AN ENGINE HESITATION OR THE ILLUMINATION OF THE MALFUNCTION INDICATOR LAMP (MIL) FOR P0123 (THROTTLE POSITION SENSOR / SWITCH (A) CIRCUIT HIGH INPUT). *NJ
0232005-11-30. Service bulletin. ENGINE AND ENGINE COOLING. HESITATION FOR A SHORT PERIOD OF TIME AFTER AN INITIAL COLD START. ECM REPROGRAMMING/UPGRADE. *TT
822005-07-13. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:GASOLINE:BELTS AND ASSOCIATED PULLEYS. IMPROVED TIMING BELTS FOR THE KIA RIO AND OPTIMA. *TT
0162004-10-15. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. O2 SENSOR ENGINE CONTROL MODULE UPGRADE. *TT
0122003-08-23. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. OPTIMA CHARGING SYSTEM - V6 ENGINE. *TT
0112003-06-19. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. CHARGING SYSTEM CHANGES TO IMPROVE ALTERNATOR OUTPUT IN HIGH AMBIENT TEMPERATURE SEVERE OPERATING CONDITIONS. *TT

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.