DPF regen while driving not working

[Sargodhianman]

Dear All,
I wonder if you can help me with an issue. I have noticed that my Audi A6 C7 doesn't regen while driving. its looks like it's deactivated. if I select Engine > adaptation > dpf regen while driving> what new value should I enter. currently, value is 0.
Please if you can help
Thanks

 

[TTT]

How long you drive this car? Are you the owner? For how long?

 

[Sargodhianman]

How long you drive this car? Are you the owner? For how long?

I owned this car for around 2 and half years. around 1 years ago the DPF cleaning message (yellow) appeared I google it and found its happened because I don't use my car a lot I that's why its appeared I need to drive on the motorway for half an hour and it will go and it did gone away if I do that. the soot value is around 29.70g. what it is doing the rpm is around 1000 its looks like its doing regen, then after some time the dpf message appeared and it tried to regen but I think its failed then after some time put it into limp mode. what is your advice? Thanks

 

[Sargodhianman]

How long you drive this car? Are you the owner? For how long?

The error is below
1 Fault Found:
8194 - Diesel Particulate Filter
P2458 00 [175] - Regeneration Duration
MIL ON - Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 1
Mileage: 159693 km
Date: 2023.05.07
Time: 13:13:47

Engine RPM: 949.50 /min
Normed load value: 43.5 %
Vehicle speed: 12 km/h
Coolant temperature: 89 °C
Intake air temperature: 75 °C
Ambient air pressure: 1000 mbar
Voltage terminal 30: 14.120 V
Unlearning counter according OBD: 40
Counter for regeneration time of particulate filter: 12600.10 s
Particle filter: kilometers since last regeneration: 213890 m
Particle filter: soot mass measured: -5.83 g
Particle filter: soot mass calculated: 23.30 g
Particl.filt.: differential pressur.sensor 1 bank 1: dyn.offset: 6 hPa

Readiness: 1 1 0 0 0

 

[TTT]

Well, while I don’t know particulars of this engine, you have to find how ecu knows a regen has been done successfully. I think it is monitoring pressure and maybe temperature before / after dpf. So what it is broken: sensors clogged, malfunction, dpf blocked by soot, etc. Remember, if dpf is full too quick, maybe engine smokes too much, it’s not dpf’s fault.

 

[Sargodhianman]

Well, while I don’t know particulars of this engine, you have to find how ecu knows a regen has been done successfully. I think it is monitoring pressure and maybe temperature before / after dpf. So what it is broken: sensors clogged, malfunction, dpf blocked by soot, etc. Remember, if dpf is full too quick, maybe engine smokes too much, it’s not dpf’s fault.

The problem is regen doesn't finish successfully that's why the limp mode is on and I have seen this error code in vcds. if the dpf is blocked with soot it will give me the red sign of dpf filter cleaning message. i think something needs reset as whatever I do this message will appear then regen failed then limp mode started. a couple of months ago I had a long drive of around 200 miles and I have driven with 2000 to 2500 rpm in 5th gear and didn't make any difference as it should be better because I have driven like that. I need you advice if you can help me, please.

 

[Crasher]

Go into login, enter the code S12345, go into Basic Settings and select “service regeneration”. The display will say press and hold brake (and clutch for manual) and release and then say press, hold and release accelerator. Now keep your feet away from the pedals and the idle will lift. Click on measuring blocks in the bottom left and enter soot in the search bar and select the soot values, then enter ash and select the values and then filter temperature and select the bank 1 EGT display that shows all four values in one line. After approx five minutes you will see the values start to climb and then smoke will come out of the exhaust, after approx 20 minutes the engine note will change and the EGT values will start to drop, let it cool down before switching off.

 

[TTT]

The problem is regen doesn't finish successfully that's why the limp mode is on and I have seen this error code in vcds. if the dpf is blocked with soot it will give me the red sign of dpf filter cleaning message. i think something needs reset as whatever I do this message will appear then regen failed then limp mode started. a couple of months ago I had a long drive of around 200 miles and I have driven with 2000 to 2500 rpm in 5th gear and didn't make any difference as it should be better because I have driven like that. I need you advice if you can help me, please.

I think you should re-read my post again, but slowly.

 

[Uwe]

Particle filter: soot mass measured: -5.83 g

That seems wrong. Problem with the pressure sensor? Plugged or leaking line(s) to the pressure sensor?

-Uwe-

 

[Crasher]

That is normal.

 

[Sargodhianman]

Go into login, enter the code S12345, go into Basic Settings and select “service regeneration”. The display will say press and hold brake (and clutch for manual) and release and then say press, hold and release accelerator. Now keep your feet away from the pedals and the idle will lift. Click on measuring blocks in the bottom left and enter soot in the search bar and select the soot values, then enter ash and select the values and then filter temperature and select the bank 1 EGT display that shows all four values in one line. After approx five minutes you will see the values start to climb and then smoke will come out of the exhaust, after approx 20 minutes the engine note will change and the EGT values will start to drop, let it cool down before switching off.

Hi,

what i have done in this week. I follow the instructions. after around 15 to 20 minutes, its stopped with time-out message and the car rpm back to normal. i have taken the screenshot

i have also drive around 500 mile round trip to see if the dpf is block but whatever i do this issue is in the loop and coming back whatever i do. the question is if dpf is full then after 500 mile drive with over 2500 rpm should clean. i think its something need to reset manually and what is that i don't know.

 

[Sargodhianman]

That seems wrong. Problem with the pressure sensor? Plugged or leaking line(s) to the pressure sensor?

-Uwe-

Thanks, i remember i have replaced the pressure sensor 1 years ago however i am not sure do i need to reset something after replacing the pressure sensor if you think please guide me what should i reset. Thanks

 

[Sargodhianman]

Well, while I don’t know particulars of this engine, you have to find how ecu knows a regen has been done successfully. I think it is monitoring pressure and maybe temperature before / after dpf. So what it is broken: sensors clogged, malfunction, dpf blocked by soot, etc. Remember, if dpf is full too quick, maybe engine smokes too much, it’s not dpf’s fault.

I don't drive a lot and the car doesn't smoke. it doesn't matter if you go 200 miles with 2500 rpm the message appears at a particular time.

 

[TTT]

Read this well: you won't fix this from a keyboard.

 

[Crasher]

You are doing that in measuring blocks, not basic settings. Do the login, possibly S12345, go into basic settings, service regen and do the pedal dance, the idle will lift and you can view the measuring blocks whilst in basic settings using the button lower left.

 

[Sargodhianman]

You are doing that in measuring blocks, not basic settings. Do the login, possibly S12345, go into basic settings, service regen and do the pedal dance, the idle will lift and you can view the measuring blocks whilst in basic settings using the button lower left.

I actually did this in basic settings and following the procedure for the regen.
Security login> entered S12345
01 - Engine> Basic Settings - 04 Used the pulldown menu and select Service regeneration of particle filter
select Show Measuring Data
in the picture, showing advanced measuring value, the process is in the back of this window.
I believe from the measuring blocks, there is no option to do service regeneration of the particle filter

 

[Sargodhianman]

Read this well: you won't fix this from a keyboard.

thanks, how can we fix this, please advise

 

[PetrolDave]

So what it is broken: sensors clogged, malfunction, dpf blocked by soot, etc.

thanks, how can we fix this, please advise

You need to physically investigate the condition of the DPF and the pressure sensors, this isn't something you can do using only a diagnostic tool - you need to get under the car and start checking things.

 

[avf383]

just for my learning, which is the important figure when doing a service regen? and what is acceptable?

soot mass measured?
soot mass calculated?

or something else?

 

[Crasher]

I have just noticed you clicked on the EGT model temps, there is an option for all four EGT's in one line. When you do the pedal dance, the the idle lift?