Volvo S40 2000–2004 — technical service bulletin
Bulletin 3658 · NHTSA communication 10022341 · issued May 1, 2007
Technical service bulletin
communication type
Engine and Engine Cooling
component
2000–2004
model years
10
vehicle entries
Official summary
Immobilizer warning lamp lit or flashing, immo-dtc 321. *kb
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.