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Old 09-09-2019   #1
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DPF problem, again. P1206.

DPF problem again.

Here's the history:

53k. Error code P1206 (Particulate filter). Engine failure. Fixed by cleaning EGR, dismantling EGR solenoid, clean MAP sensor, inspect MAF and force regen.
65k. Error code P1206 (Particulate filter). Engine failure. Fixed by cleaning EGR, dismantling EGR solenoid, and force regen. (DPF - Normal clogging - 88%)
66k. Error code P1206 (Particulate filter). Engine failure. Cleared fault and force regen. (DPF - Normal clogging - 94%)

It's now going OK but it surely won't last.

Am I missing something? Is there something else I should look at?

Cheers

Ron
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Old 15-09-2019   #2
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Re: DPF problem, again. P1206.

Hi,

At the moment it's running fine, a friend suggested that I should add a tin of BG 244: Fuel System Cleaner to a tank of diesel.

Is this stuff any good, is it snake oil? Is there anything else worth trying?

Cheers

Ron
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Old 15-09-2019   #3
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Re: DPF problem, again. P1206.

Does look like you have an underlying issue. Have you checked the following:
Oil change counter?
Is the oil level OK (going up is not good)?
How long since last oil change?
Any smell of diesel in he oil?

DPF pressure reading?
How long since last regeneration?
Is the fuel consumption normal?

Robert G8RPI.
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Old 16-09-2019   #4
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Re: DPF problem, again. P1206.

Hi Robert,

Thanks for your help.

I tend to agree with you that there is some underlying issue.

Answers to your questions:

The oil is due for a change in October, the counter reads 5, the degradation level is 65%, there's no smell of diesel in the oil.

I took an MES screen grab after I did a forced regen. It shows the differential pressure sensor at 17mBar. Clogging at 81%. Fuel consumption is normal.

Would you think that it could be down to an intermittent pressure sensor, which works most of the time and occasionally gives a spurious reading creating the P1206 error?

Many thanks

Ron
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Old 16-09-2019   #5
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Re: DPF problem, again. P1206.

Hi,
It may be a faulty sensor or blocked or leaking pipe between DPF and sensor.
You cn use the recording / graphing function of MES to monitor the pressure and rpm while driving (don't watch the screen while driving). You can review the graphs later to see if there are any odd readings.

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Old 18-09-2019   #6
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Re: DPF problem, again. P1206.

Hi Robert,

Good idea, I did as you recommended and recorded about a 10 mile run.

Engine speed, DPF temperature, EGR opening and Differential pressure.

To my untrained eye it all looks to be working but I'm not sure it's as it should be.

Attached is the csv file, could you possibly run your eye over it and see if it's all OK?

Thanks

Ron
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Old 27-09-2019   #7
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Re: DPF problem, again. P1206.

All has been running ok for the last couple of weeks, but this is still baffling me, I went for a spin today and bang on time (at 105%) the dob did a regeneration on its own, taking the clogging down to 17%.

I can't quite believe it fixed itself, be good if it had, so is there something going intermittently wrong....any ideas much appreciated.

Cheers

Ron
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Old 28-09-2019   #8
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Re: DPF problem, again. P1206.

You can buy fuel additive that help the car to regen by lowering of the temp needed for it to complete perhaps it it would be worth getting a can every few months?
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Old 28-09-2019   #9
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Quote Originally Posted by Poperon View Post
All has been running ok for the last couple of weeks, but this is still baffling me, I went for a spin today and bang on time (at 105%) the dob did a regeneration on its own, taking the clogging down to 17%.

I can't quite believe it fixed itself, be good if it had, so is there something going intermittently wrong....any ideas much appreciated.

Cheers

Ron

Hi Ron.

There are many factors controlling the timing..and ability.. or tegens.

So its oossible it just got in the correct conditions.

I suspect the required opportunity of the constant RPM for a period of time cannot be achieved easily out West..

Main reason I specced a non dpf back in
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Old 28-09-2019   #10
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Quote Originally Posted by Poperon View Post
All has been running ok for the last couple of weeks, but this is still baffling me, I went for a spin today and bang on time (at 105%) the dob did a regeneration on its own, taking the clogging down to 17%.

I can't quite believe it fixed itself, be good if it had, so is there something going intermittently wrong....any ideas much appreciated.

Cheers

Ron

Hi Ron.

There are many factors controlling the timing..and ability.. or tegens.

So its oossible it just got in the correct conditions.

I suspect the required opportunity of the constant RPM for a period of time cannot be achieved easily out West..

Main reason I opted a non dpf back in @2011..

And my 1.3 now is a 2007..although of course my M4 commute would probably work fine.

Charlie
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