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If the engine starts but car does not go forwards or backwards what is wrong?

There are a few possible reasons why your car may not be going forwards or backwards, even though the engine is running:

* Transmission problems: The transmission is responsible for transferring power from the engine to the wheels. If the transmission is damaged or not working properly, it can prevent the car from moving.

* Driveline problems: The driveline is the series of components that connects the transmission to the wheels. If any of these components are damaged or not working properly, it can prevent the car from moving.

* Wheel problems: If the wheels are not rotating, the car will not be able to move. This could be due to a problem with the tires, brakes, or wheel bearings.

* Computer problems: The computer that controls the engine and transmission may be malfunctioning. This can prevent the car from moving or cause it to move erratically.

If you are not sure what is wrong with your car, it is best to take it to a mechanic for diagnosis.