Yet another DPF drama

[YoungEnthusiast]

Hello,

I have replaced my dpf with a brand new one.
Plugged in all the sensors and the hoses to the pressure sensor
But the light is still on so I'm starting to think the pressure sensor might be bunk as per a post from 2013 but haven't the foggiest where it is or how to actually test it.

Would love some advice or to know if there's a service manual I could pinch perhaps?

I've got a 2011 Nissan Navara D40 Rx Thai built

 

[Old.Tony]

The DPF routines in the ECU don't respond to the normal clear commands. There are two ways to clear it, hopefully the first is the only one needed.

With a workshop (eg Snapon Tools) OBD tool, select "DPF Reset" from the menu. This should get the ECU to go back to normal monitoring of the sensors.

You could try looking to see if a "Regen Required" flag has been set in the ECU too, make sure that's cleared. A new DPF won't need one!

If that fails (and with a new DPF, it shouldn't) you'll need to do a regen (available as a task on the Snapon etc device). This is a nasty process, start with a full tank of fuel, and have a new oil filter and enough oil to do a full engine flush and replacement afterwards. Expect to hear the engine screaming - it is NOT kind to the motor. This will cause the ECU to reset the DPF flag.