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Service bulletins for the 2004 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.

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

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Bulletins, newest first
04022005-08-18. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. ENGINE OIL SPECIFICATIONS, OIL CAPACITY, OIL FILTER. TO INCLUDE AUDI 24 2006. *TT
1905042005-07-29. Service bulletin. ENGINE AND ENGINE COOLING. THE COOLANT RESERVOIR IS DIAGNOSED TO BE LEAKING AND INTENDED TO BE REPLACED. *TT
05022005-05-19. Service bulletin. ENGINE AND ENGINE COOLING. FUEL INJECTORS UNNECESSARY REPLACEMENT. *EH
05012005-05-19. Service bulletin. ENGINE AND ENGINE COOLING. FUEL INJECTORS UNNECESSARY REPLACEMENT. *EH
05032005-05-19. Service bulletin. ENGINE AND ENGINE COOLING:COOLING SYSTEM. COOLANT LEAK OR ON HEAT IN PASSENGER COMPARTMENT. *EH
05012005-05-19. Service bulletin. FUEL SYSTEM, GASOLINE:FUEL INJECTION SYSTEM:INJECTORS. FUEL INJECTORS, UNNECESSARY REPLACEMENT. UPDATE. *TT
4805012005-03-15. Service bulletin. STEERING:HYDRAULIC POWER ASSIST SYSTEM. POWER STEERING, NOISY. TO INCLUDE 2006 MODELS. *TT
2405012005-03-15. Service bulletin. FUEL SYSTEM, GASOLINE:FUEL INJECTION SYSTEM:INJECTORS. FUEL INJECTORS, UNNECESSARY REPLACEMENT. *TT
972005-02-03. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. FRONT OXYGEN SENSOR BANK1 AND ENGINE WIRING ENGINE. ALSO INCLUDES AUDI CABRIOLET 2004. *TT
04012005-02-03. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. ENGINE WIRE HARNESS, HEAT INSULATION INSTALLATION (IA). 2004 AUDI CABRIOLET ALSO INCLUDED. *TT
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
3704022005-01-27. Service bulletin. POWER TRAIN. TRANSMISSION SHUDDERS PRIOR TO COMING TO A STOP. *TC
04202004-11-02. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. WARRANTY EXTENSION COVERING CERTAIN OIL SLUDGE RELATED REPAIRS. *TT
04022004-11-02. Service bulletin. EXTERIOR LIGHTING:HEADLIGHTS. LIGHTSENSOR WARNING LIGHT ON INTERMITTENTLY. *TT
04012004-11-02. Service bulletin. ELECTRICAL SYSTEM. TIPTRONIC SWITCH F189, PRINTED CIRCUIT BOARD FAILURE. SELECTOR LEVER INDICATOR (PRNDL) LIGHT FULLY ILLUMINATED; TIPTRONIC FEATURE DOES NOT FUNCTION; 18152 TIPTRONIC SWITCH (F189) SHORT CIRCUIT TO GROUND. *TT
04032004-11-02. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. LOW ENGINE OIL PRESSURE LIGHT IS ON. AUDI CABRIOLET 2004 INCLUDED. *TT
04012004-11-02. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. ENGINE OIL SPECIFICATIONS, OIL CAPACITY, OIL FILTER. *TT THIS BULLETIN REPLACES BULLETIN 04-01 DATED JAN. 12, 2004. 2004 CABRIOLET, AUDI INCLUDED. *TT
04022004-11-02. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. VALVE COVER, DIAGNOSING OIL LEAKAGE FROM GASKETS. *TT
04202004-11-02. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. OIL SLUDGE - WARRANTY EXTENSION. SERVICE CIRCULAR - WARRANTY. *TT
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
04052004-08-31. Service bulletin. ELECTRICAL SYSTEM. UPDATE PROGRAMMING (FLASHING) TRANSMISSION CONTROL MODULE (TCM). *MJ

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