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A Audi A6 car with a mileage of about 90 thousand km and a 2.4L engine and a 01V automatic transmission. The accident caused the engine cylinder block and the automatic transmission shell to be damaged, and the two airbags in the cab were expanded. Troubleshooting: 1. Replace engine cylinder block, automatic transmission housing and other damaged parts, and repair the deformed part after trial run. Starting engine, engine idle speed and acceleration are normal, when the transmission lever from the N bit to the D bit slowly acceleration, the car runs also normal, but when the transmission lever returns to the N position and then re - hang into the D bit, the car has a obvious impact.