Possible causes – Variable Tumble Control Solenoid (VTCS) vacuum solenoid stuck closed– Faulty Variable Tumble Control Solenoid (VTCS)– Variable Tumble Control Solenoid (VTCS) harness is open or shorted– Variable Tumble Control Solenoid (VTCS) circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1512 MAZDA OBD Code Description Variable Tumble…