One problem related to air bag not deploy has been reported for the 2001 Audi A4. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2001 Audi A4 based on all problems reported for the 2001 A4.
2001 Audi A4 air bag light on dash. Dealer checked and stated air bag module bad. Order one and was installed April 27, 2010. Part # 8d0-959-655-g module. This is a major safety item. Can cause air bags to not deploy. Should last longer than it did.