One problem related to starter has been reported for the 1997 Audi A8. The most recently reported issues are listed below.
The ignition switch in my 1997 Audi A8 failed internally and was disabled in it's ability to spring back from the start position. With the switch contacts in a position between start and run, none of the electrical auxiliary equipment will operate. This includes the headlights / taillights, turn signals , wipers and other systems. This condition can also allow the starter to remain engaged with the engine running. In this instance, this occurred the first time at night with my wife. I believe that this failure represents a serious safety issue. Research on the internet reviled that this failure has been well documented on other Audi models. The NHTSA has previously issued recalls on the 1997 a6 (00v317000) and 1996 a4 (96v017000) models due to failure of the ignition switch. I contacted Audi USA customer service (reps. Name- megan) and entered a complaint - case#30325223 the dealership was contacted by Audi USA the ignition switch was replaced by the Audi dealer at a cost of $535. 00 fully charged to me.