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Service bulletins for the 1998 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.

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

By type

By component

By trouble code

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
JK2005-07-29. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:GASOLINE:BELTS AND ASSOCIATED PULLEYS. CUSTOMER SATISFACTION CAMPAIGN JK TO INSPECT THE TIMING BELT ON VEHICLES WITH INTERNAL ENGINE DAMAGE RESULTING FROM A BROKEN TIMING BELT. *TT
04062005-02-03. Service bulletin. ENGINE AND ENGINE COOLING:COOLING SYSTEM:HOSES/LINES/PIPING/FITTINGS. COOLANT LEAK AT OIL COOLER HOSES. *TT
JE2005-01-29. Service bulletin. SUSPENSION:FRONT:CONTROL ARM:LOWER ARM. CHECK/REPLACE REPLACE FRONT SUSPENSION LOWER CONTROL ARMS. *TC
04202004-11-02. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. WARRANTY EXTENSION COVERING CERTAIN OIL SLUDGE RELATED REPAIRS. *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
04082004-10-19. Service bulletin. FUEL SYSTEM, OTHER. LONG TERM FUEL TRIM - SYSTEM TOO RICH. DIAGNOSTIC TROUBLE CODE P1123, P1125, P1137 AND P1139. *TT
04012004-07-21. Service bulletin. ELECTRICAL SYSTEM. THROTTLE VALVE CONTROL MODULE - J338-, WILL NOT ADAPT. *MJ
0428042004-05-27. Service bulletin. SUSPENSION:FRONT:CONTROL ARM:LOWER ARM. SERVICE ACTION TO INSPECT LOWER CONTROL ARM SEALS. *TT
0926032004-05-15. Service bulletin. STEERING:HYDRAULIC POWER ASSIST:PUMP. ZF VH RECALL OF THE ZF STEERING PUMP, SUPPLIED TO WD'S FOR REPLACEMENT OF THE AUDI A4 PASSAT P/N 8D0 145 156FX INSTEAD OF THE CORRECT ZF P/N 7691 955 276ZW. 2004 AUDI A4 ALSO INCLUDED. *TT
9001042002-02-05. Service bulletin. ELECTRICAL SYSTEM:WIRING:INTERIOR/UNDER DASH. SUBJECT REGARDING INSTRUMENT CLUSTER, DRIVER'S INFORMATION DISPLAY FADES. *JG
4001012002-02-05. Service bulletin. SUSPENSION:FRONT. SUBJECT REGARDING NOISY FRONT SUSPENSION. *JG
9001022002-02-05. Service bulletin. ELECTRICAL SYSTEM:WIRING:INTERIOR/UNDER DASH. SUBJECT REGARDING INSTRUMENT CLUSTER, DRIVER'S INFORMATION DISPLAY FADES. *JG
1501022001-09-25. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:GASOLINE. A CONDITION MAY EXIST WHERE THE ENGINE CRANKS BUT WILL NOT START. *TT
112001-09-25. Service bulletin. ELECTRICAL SYSTEM. THIS TECHNICAL REPAIR MANUAL CONTAINS THE ELECTRICAL WIRING DIAGRAMS, TROUBLESHOOTING AND COMPLENT LOCATIONS. *TT
1501012001-07-03. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:GASOLINE. A CONDITION MAY EXIST WHERE THE ENGINE MAY CRANK BUT WILL NOT START. *TT
99021999-08-13. Service bulletin. STRUCTURE:BODY:DOOR. CONDITIONS WITH CREAKING NOISE FROM CENTER ARMREST ON VEHICLES VIN 8D_WA240851. *TT
98031999-04-29. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION. PROCEDURES ON INSTALLING TRANSMISSION SOUND DEADENING SHIELDS *TT
98041999-04-29. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. VEHICLE EXHIBITING A WHINING / WHIRRING TYPE NOISE AT CERTAIN MPH RANGES. *TT
98011999-02-17. Service bulletin. UNKNOWN OR OTHER. SUBJECT ON FLOOR MAT FASTENER VARIATIONS. *YC
98031999-02-17. Service bulletin. VISIBILITY:GLASS, SIDE/REAR. EXPERIENCING CREAKING / POPPING NOISES FROM REAR WINDOW. *YC
98011999-02-17. Service bulletin. EQUIPMENT:MECHANICAL:CARRIER/RACK. SUBJECT ON LUGGAGE COVER HANDLE, REPLACING. *YC

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