Audi A4 2002–2004 — technical service bulletin
Bulletin 0401 · NHTSA communication 10009734 · issued Sep 10, 2004
Technical service bulletin
communication type
Engine and Engine Cooling
component
2002–2004
model years
4
vehicle entries
Official summary
Map controlled engine cooling thermostat, servicing. Audi a4 2002-2005 and audi cabriolet 2003-2005. *tt
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.