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Q: starting on 2001 Audi S4

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
my s4 will turnover but it wont start its been fine until this happened why is this happening?
(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.
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