Possible Causes
WARNING: This page is about a different car, the 2002 Mazda B4000, 2002 Mazda B3000, and 2002 Mazda B2300. However, it is still accessible from the selected car via links, so may be relevant.
Possible causes are:
- Damaged DPFEGR sensor.
- EGR valve stuck open.
- Slow responding DPFEGR sensor.
- Plugged EGR tube.
- EGRVR circuit shorted to ground.
- Plugged EGRVR vent.
- Improper vacuum hose connection.
- Plugged vacuum hoses.
- Damaged EGRVR solenoid.
- Damaged PCM.