BMW X3 B47 engine DPF regen
Discussion
I have never been able to get to the bottom of why and when my 20d X3 does a regen. The local BMW dealer can only give me a vague answer along the lines of 'when it needs one periodically'. However I have seen my car on more than 1 occasion do a regen after a major motorway thrash. eg Went to Gatwick and back from the west country in warm weather and it did a regen the following day ! Most of my driving is motorway as I can go for days without using the car and then do 250 miles. Does anyone have the gen on this ?
Unfortunately, I don't think you can accurately predict when it will happen.
The ECU measures the soot quantity & the differential pressure across the DPF and when these reach certain trigger points it realises a regen is required.
It will then trigger a regen the next time the engine conditions are correct to support a regen, as in engine temp, engine revs etc.
The ECU measures the soot quantity & the differential pressure across the DPF and when these reach certain trigger points it realises a regen is required.
It will then trigger a regen the next time the engine conditions are correct to support a regen, as in engine temp, engine revs etc.
You can tell when it's doing/done a regen as the tailpipes get scalding hot, otherwise there is no clue on modern BMWs.
On my 2009 Golf CR diesel, I know it's doing a regen because the coolant fans go ballistic and it's like an oven under the hood. But with my 2016 330d, there is absolutely no indication it's doing a regen, other than roasting hot tips, but only nutters like me think to fondle their tailpipes
However, if you get yourself Bimmerlink, it tells you when the last regen was performed, and it seems like on my car at least, it has a scheduled regen every 1000KM. I do 25K a year so the bulk of my regenning is passive. You can also trigger a forced regen with that tool as well iirc, but personally I would just let the algorithms manage it for you.
On my 2009 Golf CR diesel, I know it's doing a regen because the coolant fans go ballistic and it's like an oven under the hood. But with my 2016 330d, there is absolutely no indication it's doing a regen, other than roasting hot tips, but only nutters like me think to fondle their tailpipes
However, if you get yourself Bimmerlink, it tells you when the last regen was performed, and it seems like on my car at least, it has a scheduled regen every 1000KM. I do 25K a year so the bulk of my regenning is passive. You can also trigger a forced regen with that tool as well iirc, but personally I would just let the algorithms manage it for you.
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