The CMP sensor (Camshaft Position Sensor) is an electronic device that is used in motors, in order to record the speed at which the camshaft rotates. Then this information is sent to the ECM (Engine Control module) who uses it to control the fuel injection, as well as the ignition time.
Retraction of the camshaft is detected by the CMP sensor, and in this way identifies a cylinder specifically. The position of the piston is also detected by the CMP sensor. If a fault occurs in this sensor, the ECM will not know when a valve opens or closes.
Diagnostic codeP0342 OBDII indicates that the CMPsensor signal is low or does not have the necessary power