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Home › Mazda › 2003 › Tribute ES, FWD › Repair and Diagnosis › Engine Performance › System › Engine Controls - Self-Diagnostics › Diagnostic Tests › DTC P0403 Or DTC P1409 › Possible Causes

Possible Causes

Possible causes are:

EGRVR circuit shorted to GND.
EGRVR circuit shorted to VPWR.
Damaged EGRVR solenoid.
Damaged PCM.
Open EGRVR circuit.
Open VPWR circuit to EGRVR solenoid.