I own a 1993 Audi 100 Q with 208,000 miles on 6-cylinder engine. I accidently bumped into the front wall of a parking ramp and now car won't start. Motor will crank, but no spark. Ignitor and crank sensor have been replaced. Is there an auto shut down on this model?

In reading about this I can't find a fuel cut-off or shut-off switch on the car. Ford is the big player in putting those on vehicles. I see some newer Audi's are putting them on. If there is one on your car it should be located in the trunk is a side panel possibly.

Is it possible that a alarm system has engaged on the car shutting it down?

Check all wiring to the fuel pump. I had that problem about a month ago