DPF and Engine Check Light are illuminated, 2.0 CR TDI

I've been having the DPF light come on intermittently for a few weeks, and the car isn't regenerating properly. I've then manually forced a regeneration, and it seems to work for a few days. Before this started, the car threw the following error: 5120 - Bank 1 Sonde 1 P2196 00 [039] - Signal too rich. I then replaced the sensor, but the error persists.

What's also strange is that the injector for cylinder 2 seems to be operating slightly differently.

From my perspective, both the LLR regulation and the deviation appear to be acceptable. As long as the probe malfunction persists, I would prioritize addressing that issue first.

Best regards,
Guste

And what can I do with the probe? I already replaced it.

Today, the DPF light came on by itself.
After about 100km on the highway. It's also producing a lot of white smoke when it regenerates. While it always does this when it regenerates, it's not doing so for such a long period. I also don't drive very short distances. I drive 40km to work, 20km on the highway, and I've been doing this for 3 years, but it has never done this before. And after the DPF light came on today, the MIL with the same error appeared after about 50km.

White clouds during regeneration are noticeable, as they are typical for unburned fuel (I'm temporarily omitting the coolant).

But first - is the lambda sensor an original part? The part number is correct, the installation was carried out according to specifications, and the cable is in good condition, as is the supply voltage?

If the sensor is functioning correctly, the "too rich" error message indicates either excessive or non-functioning exhaust gas recirculation (EGR). Without sufficient oxygen, the DPF will not regenerate.
hg
Herbert

Hello Herbert, he always gets these white clouds when he's regenerating, usually between 6 and 700km.

Yesterday morning, he also started regenerating, but it kept stopping because the clouds wouldn't appear.

And this morning, the DPF light came on. After about 40km, the warning light also started flashing. I pulled over because it was also losing power, probably in limp mode.
He had this error then

5120 - Bank 1 Sonde 1
P2196 00 [101] - Signal too high
Unconfirmed - Checked since last clear
Environmental conditions:
Error status: 00000001
Error priority: 2
Error frequency: 1
Mileage: 274151 km
Date: 2076.14.14
Time: 21:28:03

Engine Speed: 2504.50 /min
Normalized Load Value: 0.0 %
Vehicle Speed: 148 km/h
Coolant Temperature: 92 °C
Intake Air Temperature: 41 °C
Ambient Air Pressure: 970 mbar
Voltage Terminal 30: 13.980 V
Fault Counter after OBD: 40

8194 - Diesel Particulate Filter
P2458 00 [175] - Regeneration time
Warning light ON - confirmed - checked since last clearing
Environmental conditions:
Error status: 00000001
Error priority: 2
Error frequency: 1
Mileage: 274438 km
Date: 2076.14.16
Time: 10:21:46

Motor Speed: 1816.50 /min
Normalized Load Value: 91.8 %
Vehicle Speed: 107 km/h
Coolant Temperature: 84 °C
Intake Air Temperature: 24 °C
Ambient Air Pressure: 990 mbar
Voltage Terminal 30: 14.260 V
Fault Counter after OBD: 40
Counter of Diesel Particulate Filter Regeneration Time: 12600.10 s
Particulate Filter: Kilometers since last regeneration: 555459 km
Particulate Filter: Measured soot mass: -1.41 g
Particulate Filter: Calculated soot mass: 14.16 g
Particulate Filter Dynamic Offset Differential Pressure: -3 hPa

I deleted it because I had an appointment at the hospital and didn't have much time. It started working normally again, but it started regenerating again. I then forced it to regenerate this afternoon when I was home again.

The Lambda is from Bosch. I also think the old one wasn't broken. I didn't check the voltage. What I notice is that it's consuming a lot of power.

Hello,

Zitat:

Mileage: 274438 km

Did I miss something, or has the DPF already been cleaned?
If not, it's probably just full of ash.

The amount of ash or the ash volume can be read out using VCDS.

See also:
/viewtopic.php?t=24243

Best regards, Rainer

Good morning everyone, no, the DPF hasn't been cleaned yet . But I already suspected it was because of that. It has never caused any problems before. I'm going to remove it, but not until next week. Last night, I noticed that it was briefly jerking between 1700-2000 RPM. It feels like a misfire, but it's not happening all the time. I'll let you know what it looks like when I take it out.

Okay, I've cleaned the DPF. After that, it still sputtered a bit, but now it's working as it should. However, it's still throwing an error code indicating that the fuel mixture is too rich. And the stuttering only occurs at around 2000-2200 RPM. And only when the engine is warm. And it doesn't do it during regeneration. I also made a video showing how easy it is to remove the DPF.

Frankbe hat folgendes geschrieben:

... 8194 - Diesel Particulate Filter P2458 00 - Regeneration time Warning light ON - confirmed - checked since last reset Diesel particulate filter regeneration cycle counter: 12600.10 s...

It seems that each of the last regenerations has been interrupted. 12600 s = 3.5 h.
I find it questionable to verschandeln a particulate filter without first burning off the soot load.
However, the primary problem seems to be the excessively high value of the lambda sensor. If the part is original from VW, I would check the AGR system and the intake path, including the intake valves, especially the throttle and AGR valve.
Lack of fresh air leads to too much soot, incomplete combustion, and a rich mixture.
Replacing the DPF is likely necessary, but only after the lambda sensor problem has been resolved.

Herbert

I'm planning to check the throttle body and the rest of the system on Saturday and see how far I can get. On Saturday on the highway, everything was fine, I drove 800 km and at 700 km, it regenerated for about 25 km. But yesterday, after about 300 km, it took about 120 km.

And what do you think about replacing the DPF? Maybe someone can recommend a good one. I also think that after 280,000 km, it might be time for a new one.

Good morning everyone. I've just removed the throttle body. I'll be removing the intake manifold later today. I'll send some pictures. It looks really bad.

I have now driven the first 800 km since cleaning the throttle body and intake manifold. It is now running as it did before. It runs perfectly for about 25 km, but then the error message "mixture too rich" appears again after about 100 km. I will remove the air filter on the weekend; it definitely won't look any better than the throttle body.

Hi,

makes sense at that mileage.

Best regards, Rainer

Hi,
and inspect the intake manifold.
There's probably dirt and grime everywhere.
hg
Herbert

Hi Herbert. I also had the intake manifold, complete with the DK. It wasn't terrible, but it was definitely corroded. And it's running much better now, I didn't even know it had so much power .

Good morning and have a nice Sunday. Yesterday I cleaned the AGR. It wasn't as bad as the Dk, but it was also very dirty. And I drove about 80 km yesterday. And it's running differently and better now. The jerking at 1800-2000 is gone. And it's no longer showing any errors. I should have started with the Dk and the AGR right away. But now I know how the DPF fails . Unfortunately, I forgot to take pictures.