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Audi A4The Audi A4 model offers nimble handling and performance that makes it one of the leading cars in its class. Read more about the Audi A4 in the Audi A4 review.
Its an emmision item only. It pressureizes the gas tank to check for leaks. Check for vacuum leaks going to the pump. Theres a vacuum line going from the engine to the rear of the vehicle.