We all know that we have to make the best ratio of air and fuel in the engine in order that your car runs smoothly. The amount of air is on duty of throttle body, and there is a throttle plate on the throttle body. Therefore, the amount of air depends on the position of the throttle plate, and the throttle plate is controlled by the gas pedal. The throttle position sensor reads the position of the gas pedal in your Engine Control Unit. Here are some signs indicating your throttle position sensor needs to be replaced: if your engine stalls or misfires, if the engine is in poor performance; if there is a loss of power; if the transmission does not shift correctly. If the throttle position sensor is broken, the information cannot be transfer to computer, and the gear cannot be changed, further leading to your BMW cannot start. Don't worry too much, and all you need is a brand new throttle position sensor from here. We offer you all BMW genuine OEM throttle position sensor with a discounted price.