One problem related to air bag has been reported for the 2001 Volvo S40. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2001 Volvo S40 based on all problems reported for the 2001 S40.
Battery was drained, and this caused car not to start at 150 miles. Srs light kept coming on at 1100 miles. This indicated that there was something wrong with airbags. At 1400 miles, srs light appeared again after dealer had corrected problem. The vehicle failed to start. The forward and backward seat adjustment was not working. There was noise coming from the sunroof. The engine was noisy. The engine light came on.