One problem related to air bag has been reported for the 2004 Volvo S40. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Volvo S40 based on all problems reported for the 2004 S40.
No collision. Srs light has been coming on since 2007. Dealership has replaced wiring, air bags and nothing helps. Srs light comes on every 7 to 12 months. This has been going on for 11 years.