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Discussion Starter · #1 ·
Hey.
Got the particle filter warning earlier.
Checked the temps with the torque app, was around 75 and went to 85 when stationary for a bit.
Can't read codes yet as laptop is on the blink.
Thinking of filling with diesel and adding a dpf regen additive then going for a spin down the motorway.
Any other ideas?

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If there is code for DPF (too high back pressure) the regeneration won't activate before the code is erased even if other factors are OK.
 

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You need to change your thermostats

Then fill it with fuel and drive normally down the motorway

DO NOT hold it in a lower gear and keep the revs up







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Discussion Starter · #7 ·
Just scanned with torque app and getting P14A7 flow resistance too high.

How can I get this to regen?

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Just scanned with torque app and getting P14A7 flow resistance too high.

How can I get this to regen?
If other requirements are fulfilled it would be best to activate regeneration request with diagnostics and then steady highway driving and keep erasing that fault code if it comes on again.
 

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Discussion Starter · #9 ·
Thanks.
I can't get inpa to work with this car so can't force a regen, only got torque app and can't regen on there also.
You said 75c and over for a regen, what are the other requirements?

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Discussion Starter · #10 ·
Just went out for a motorway drive, 20 miles or so.
Was monitoring the temp and was 74-80 on the motorway.
Not sure if the code was re-appearing, but I cleared anyway as I drove.

On restarting I didn't get the P14a7 but did get the 'particle filter' warning...

I assume it therefore hasn't regen'd, do you think these temps are too low?


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That other particle filter code may be just the calculated ageing warning. This can be cured by telling with diagnostics that the particle filter is renewed (even it is not touched).

Those coolant temps are still a little low. It should be quite constant 88-92 C when warmed up, and goes to 92-95 C when regeneration is active. Regeneration is also seen on exhaust temps rising from ~300 C to ~600 C.

From WDS:

Regeneration of particulate filter DDE5.0/ 6.0/ 6.2

To enable regeneration of the particulate filter, regeneration must be requested in the DDE control unit.

The regeneration is requested in that the consumed fuel since the last regeneration is set to a maximum value in the DDE control unit.
The regeneration is started at the next trip as soon as the coolant temperature has reached a value of at least 75 °C and the exhaust-gas temperature before cat. has reached a value of at least 240 °C. Moreover, the fuel level must be at least 10 litres.

The best possible effect of the regeneration is achieved if the vehicle is operated for around 20 minutes at a speed of at least 60 kph that is as constant as possible as of the start of the regeneration. Experience has shown that non-urban driving achieves the best regeneration results.

The current state of any regeneration block, of a regeneration request in the control unit and the regeneration itself can be displayed both in the service function ”Regeneration of particulate filter” and in the DDE diagnosis request at the point ”Regeneration particulate filter”. Moreover, the distance driven since the last regeneration can be read out.


The following possible states on regeneration are displayed:
•Regeneration blocked

•Regeneration released

•Regeneration in DDE requested

•Regeneration not requested


The following possible statuses of the regeneration are displayed:
•Regeneration active

•Regeneration not active

•Distance driven since (last successful) regeneration in metres

•Calculated total residual distance of the particulate filter in kilometres
(only available as of DVD47 - only in vehicles with 6.cylinder diesel engines).

•Average fuel consumption per 100 km since filter replacement
(only as of DVD47 - only available in vehicles with 6-cylinder diesel engines).

•Distances driven since the last but one and last but two regenerations in kilometres
(only available as of DVD47 - only in vehicles with 6.cylinder diesel engines).



Notes:

In the event of a prematurely cancelled regeneration, the regeneration is started in the next drive cycle as soon as the coolant temperature has returned to a value of 75 °C and the exhaust-gas temperature before cat. has returned to a value of 240 °C.

In the case of a particulate filter heavily loaded with soot, it can occur that the regeneration request is blocked again after a short time or is not released.
In this case, it is required to regenerate the particulate filter in a motorway / or cross-country trip taking approx. 30 minutes at a speed that is a constant as possible.
Subsequently, the service function ”Regeneration particulate filter” must be run again.

Moreover, it also occurs that with a filter heavily soiled with soot the exhaust-gas back-pressure becomes so high that problems can occur on reaching breakaway speed. In many cases, this impairs the feasibility of the exhaust backpressure test. A clean regeneration reduces the effect of this problem in many cases and lowers the exhaust-gas back-pressure.

During the regeneration phase and with the engine running, it can also occur that the display for 'Regeneration active' jumps to 'Regeneration not active'. This behaviour can be seen exclusively with the vehicle stationary with the engine running. This behaviour does not impair the scheduled course of the regeneration in general.
 

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Discussion Starter · #12 ·
Ok I've just been doing some town driving and was checking the temps at the time, 80-95 degrees is what I was getting, I thought a regen would activate at this temp?

What other factors could prevent a regen?

Thanks in advance.

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Ok I've just been doing some town driving and was checking the temps at the time, 80-95 degrees is what I was getting, I thought a regen would activate at this temp?

What other factors could prevent a regen?
*Coolant temp >75 °C
*Exhaust-gas temp before cat. >240 °C
*Fuel level >10 litres
*No active fault codes regarding DPF system (pressure sensor, temp sensor, too high back pressure, throttle valve)
 

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Pressure Sensor!!!!

Had the same problem.
Everybody neglects to mention that if your pressure sensor is faulty you will get this error.
I tried everything until I read a post pointing me to the pressure sensor, used Carly for BMW to check pressure and sure enough it was reading a ridiculously high number.
Replaced and the sensor, problem solved.

Hope this helps.
 

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Had the same problem.
Everybody neglects to mention that if your pressure sensor is faulty you will get this error.
I tried everything until I read a post pointing me to the pressure sensor, used Carly for BMW to check pressure and sure enough it was reading a ridiculously high number.
Replaced and the sensor, problem solved.

Hope this helps.
It's still very rare that the pressure sensor would fail so that it would show false high pressure reading if it's showing correct atmospheric pressure when engine is not running.
 
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