If the Conlogsytem has a Problem the Engine wil not start.
If the Car has a Conlog,
there is a Plug with a red LED in Centerconsole above the Radio.

Gude Mario Audi 100 CD Autom. Bj.83 Audi 200 20v Bj.89 Audi 5000 Bj.85 Audi V8 3,6 Autom. Bj.88