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
Only bulletins with component: Engine are shown. Show all
| 0401 | 2004-11-02. 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 |
|---|---|
| 0402 | 2004-11-02. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. VALVE COVER, DIAGNOSING OIL LEAKAGE FROM GASKETS. *TT |
| 0420 | 2004-11-02. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. OIL SLUDGE - WARRANTY EXTENSION. SERVICE CIRCULAR - WARRANTY. *TT |
| 150102 | 2001-09-25. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:GASOLINE. A CONDITION MAY EXIST WHERE THE ENGINE CRANKS BUT WILL NOT START. *TT |
| 150101 | 2001-07-03. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:GASOLINE. A CONDITION MAY EXIST WHERE THE ENGINE MAY CRANK BUT WILL NOT START. *TT |
| 9804 | 1999-04-29. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. VEHICLE EXHIBITING A WHINING / WHIRRING TYPE NOISE AT CERTAIN MPH RANGES. *TT |
| 9801 | 1999-02-03. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:GASOLINE:TURBO/SUPERCHARGER. TURBOCHARGER, FAILURE DUE TO LACK OF LUBRICATION. *YC |
| 9706249701F | 1998-03-30. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. SUBJECT ON CYLINDER HEAD REMOVAL AND INSTALLATION. *YC |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.