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:
- Vacuum supply.
- EGR valve stuck closed.
- EGR valve leaks vacuum.
- EGR flow path restricted.
- EGRVR circuit shorted to power.
- VREF open to DPF EGR sensor.
- DPF EGR sensor downstream hose off or plugged.
- EGRVR circuit open to PCM.
- VPWR open to EGRVR solenoid.
- DPF EGR sensor hoses both off.
- DPF EGR sensor hoses reversed.
- Damaged EGR orifice tube.
- Damaged EGRVR solenoid.
- Damaged PCM.