General: - Ownership Thread - 2012 XC90 Executive

SwissXC90 · Apr 13th, 2019, 05:33

When a crack or large leak in the charge air inlet exists, the ECU over-compensates with fuel (how much depends o the size of the air leak) and produces much much higher soot than normal.

This can lead to very rapid clogging of the DPF.

If the DPF gets clogged with soot beyond a level where it can be regenerated then the options are:

1. DPF cleaning through a manualy triggered DPF regeneration cycle (on the car, using the engine for heat)
2. DPF removal and cleaning with chemicals (liquid)
3. DPF removeal and cleaning in an oven (to burn off the soot)
4. DPF renewal

At any rate the DPF needs regen or cleaning or replacement. You cannot avoid that.

Maybe you car has a bad pressure sensor, and because of that it won't go into a DPF regen cycle.
That would be good, because it is cheaper and easier to replace the sensor than the DPF.
Once the new sensor is fitted, the pressures return to normal readings, and the ECU can then initiate a manual cleaning cycle.

Apr 13th, 2019, 05:33	#10
SwissXC90 Premier Member Last Online: Mar 20th, 2024 18:26 Join Date: Jan 2016 Location: Cross Country	When a crack or large leak in the charge air inlet exists, the ECU over-compensates with fuel (how much depends o the size of the air leak) and produces much much higher soot than normal. This can lead to very rapid clogging of the DPF. If the DPF gets clogged with soot beyond a level where it can be regenerated then the options are: 1. DPF cleaning through a manualy triggered DPF regeneration cycle (on the car, using the engine for heat) 2. DPF removal and cleaning with chemicals (liquid) 3. DPF removeal and cleaning in an oven (to burn off the soot) 4. DPF renewal At any rate the DPF needs regen or cleaning or replacement. You cannot avoid that. Maybe you car has a bad pressure sensor, and because of that it won't go into a DPF regen cycle. That would be good, because it is cheaper and easier to replace the sensor than the DPF. Once the new sensor is fitted, the pressures return to normal readings, and the ECU can then initiate a manual cleaning cycle. __________________ XC90 R-Design MY2009, Black Sapphire Metallic. HP-Sound, RSE, Nav, Tel, ParkingCam, BLIS, ParkingHeater, RestHeat, Removable Towbar, Summer: CRATUS 20x8 on Pirelli Scorpion Zeros 255/45, Winter: NEPTUNE 17x7 on Continental WinterContact 4x4 235/65.

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