Possible causes – Failed Camshaft Actuator– Variable Camshaft Timing Actuator harness is open or shorted– Variable Camshaft Timing Actuator circuit poor electrical connection– Engine mechanical problems Symptoms – Engine Light ON (or Service Engine Soon Warning Light)– Lack/Loss of power– Engine rough idle P0020 BMW OBD Code Description Variable Camshaft Timing ‘A’ (VANOS) Circuit Continuity