Detection Condition
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.
- DTC P1405 indicates exhaust manifold side (upstream) DPFEGR sensor pressure hose is off or plugged.
- DTC P1406 indicates intake manifold side (downstream) DPFEGR sensor pressure hose is off or plugged.
Differential Pressure Feedback (DPFEGR) sensor measures actual pressure drop across the metering orifice and relays a proportional voltage signal to PCM.