One problem related to side/window air bag has been reported for the 2008 Audi A4. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2008 Audi A4 based on all problems reported for the 2008 A4.
Takata recall. I was notified at the beginning of July that my vehicle was affected by the takata recall for the passenger side airbag, but that no solution was available. I requested more information both from my local Audi dealership as well as from Audi USA and received no definitive answer. The best estimate the dealership could give me was 8 months to a year before a solution. This means that I can not safely have a passenger in the vehicle or our infant int he back seat for that period of time, essentially rendering the vehicle useless. This does not seem like a reasonable time period to me and I would like the NHTSA to evaluate the situation.