P1391 Mazda Wheel Speed Sensor 1, G-Sensor Circuit Performance
Possible causes
– Timing belt or chain stretched or jumped
– Faulty Camshaft Position (CMP) Sensor
– Camshaft Position (CMP) Sensor harness is open or shorted
– Camshaft Position (CMP) Sensor circuit poor electrical connection.
– Faulty Camshaft Position (CMP) Sensor
– Camshaft Position (CMP) Sensor harness is open or shorted
– Camshaft Position (CMP) Sensor circuit poor electrical connection.
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P1391 Mazda Description
The ECM detected the actual Camshaft Position Sensor (CMP) position disagreed with the expected CMP level.
Mazda Vehicle:Mazda B-Series, Mazda CX-7,Mazda CX-9,Mazda MAZDA2,Mazda MAZDA3,Mazda MAZDA5,Mazda MAZDA6,Mazda Miata MX-5,Mazda RX-8,Mazda Tribute,Mazda RX-8,Mazda MX-5,Mazda CX-9,Mazda Atenza,Mazda Axela,Mazda Tribute,