I have a Audi A4 2007 it won't start I don't know what's wrong with it
Have the battery tested or the car jump started first. If it starts, look to replace the battery. Call AAA or roadside assistance to have your car towed to an independent Audi garage for repair. No sense guessing at this point.
you could try describing the issue but most common issues can be solved by checking the battery as tom stated
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