starting on 2001 Audi S4

my s4 will turnover but it wont start its been fine until this happened why is this happening?

Asked by for the 2001 Audi S4
1 answer
It could many things, so first check for any codes for a sensor that may be worn out. then see if you have spark, then if you have spark then check for fuel by checking fuel pressure. these are the basic procedures for checking a crank but no start condition. Also does the key icon keep flashing because that would be a security-key-code problem.