my car is audi a6 2007 2.4 ( 100,000 mile)
first the battery was very weak, this may be cause unstable start of the car, but after the car running for about 10 km. then went off suddenly. when i turn the key again to switch on, hard noise taking place in the engine!!?
What makes this problem better or worse?
it is worse ( hard noise in the internal parts in the engine)
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