What are the symptoms of a faulty camshaft position sensor?

[OSawyer]

During the starting process, symptoms such as crankshaft reversal and backfire in the intake manifold may occur. The car may experience unstable idling, severe shaking, lack of power during acceleration, increased fuel consumption, excessive exhaust emissions, and unpleasant black smoke from the exhaust pipe. These symptoms may indicate a damaged camshaft position sensor, and prompt inspection and repair are recommended. The functions of the camshaft position sensor are: 1. To collect the camshaft movement angle signal and input it into the electronic control unit (ECU) to determine the ignition timing and fuel injection timing. 2. The camshaft position sensor is also known as the cylinder identification sensor. To distinguish it from the crankshaft position sensor (CPS), the camshaft position sensor is generally denoted as CIS. 3. The function of the camshaft position sensor is to collect the position signal of the valve camshaft and input it into the ECU, so that the ECU can identify the top dead center of cylinder compression, thereby enabling sequential fuel injection control, ignition timing control, and knock control.