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Service bulletins for the 2003 Audi A4

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.

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

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Only bulletins with component: Cooling system are shown. Show all

Bulletins, newest first
Edition922023-02-06. Service bulletin. ENGINE AND ENGINE COOLING:COOLING SYSTEM. Idenifying and mixing factory fill engine coolants
AWA-08-032008-07-28. Service bulletin. ENGINE AND ENGINE COOLING:COOLING SYSTEM. AUDI SERVICE CAMPAIGN: SEE DOCUMENT SEARCH BUTTON FOR OWNER LETTER. ENGINE COOLANT TEMPERATURE SENSOR WARRANTY EXTENSION FOR CERTAIN 2001-2004 AUDI MODEL YEAR VEHICLES. CSC WAS RECEIVED *PE
05032005-05-19. Service bulletin. ENGINE AND ENGINE COOLING:COOLING SYSTEM. COOLANT LEAK OR ON HEAT IN PASSENGER COMPARTMENT. *EH
04062005-02-03. Service bulletin. ENGINE AND ENGINE COOLING:COOLING SYSTEM:HOSES/LINES/PIPING/FITTINGS. COOLANT LEAK AT OIL COOLER HOSES. *TT
04112005-01-27. Service bulletin. ENGINE AND ENGINE COOLING:COOLING SYSTEM. UPDATE PROGRAMMING ENGINE CONTROL MODULE FLASHING TO CORRECT EVAP PURGE VALVE DTC P0441 IN THE AUDI 2004 CABRIOLET . *TC
04012004-10-19. Service bulletin. ENGINE AND ENGINE COOLING:COOLING SYSTEM. MAP CONTROLLED ENGINE COOLING THERMOSTAT, SERVICING. AUDI A4 2002-2005 AND AUDI CABRIOLET 2003-2005. *TT

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