P0402 MAZDA Exhaust Gas Recirculation Flow Excessive Detected

Possible causes
– EGR volume control valve stuck open
– Faulty EGR volume control valve
– EGR solenoid valve harness is open or shorted
– EGR solenoid valve circuit poor electrical connection
– Faulty EGR temperature sensor and circuit
When is the obd code mean?
High Exhaust Gas Recirculation (EGR) flow control is detected
– Engine Light ON (or Service Engine Soon Warning Light)
– Possible engine hesitation
P0402 MAZDA OBD Code Description