DPF & Engine Light: 2.0 TDI Troubleshooting

"For a few weeks now, the DPF light has been coming on intermittently, and the DPF isn't regenerating properly. I've been forcing regeneration, and it works for a few days, but then the problem returns. Before this started, the car had an error code: 5120 - Bank 1, Sensor 1, P2196 00 [039] - Signal too rich. I replaced the sensor, but the error code is still there."

What seems strange to me is that the nozzle on the second cylinder is slightly out of alignment.

The LLR regulation and the deviation seem acceptable to me. As long as the probe error persists, I would focus on resolving that first.

Regards,
Guste.

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

Today, the light on the dashboard turned off by itself.
After approximately 100 km on the highway, it also produces a lot of white smoke when it's regenerating. It has always produced some white smoke during regeneration, but not for such a long period. I don't drive much in the city; my commute to work is 40 km, of which 20 km is on the highway. I've been doing this for 3 years, but it's never behaved like this before. And after the DPF light went out today, the check engine light came on after about 50 km, with the same error code as mentioned above.

I find the white smoke that appears during regeneration quite noticeable, as it's typically indicative of unburned fuel (I'm not considering the coolant in this case).
But first - is the replacement oxygen sensor an original part? Does the TL number match? Was the installation done according to specifications? Are the cables in good condition, and is the supply voltage correct?

With a properly functioning sensor, the error message "too rich" would indicate either excessively high or incomplete exhaust gas recirculation. Without sufficient oxygen, the DPF (Diesel Particulate Filter) will also not regenerate.
hg
Herbert.

Hello Herbert, he's always been doing that with the white clouds when he regenerates, usually at a distance of around 6 to 700 kilometers.

Yesterday morning, while he was at work, he started the regeneration process again, but it kept stopping because clouds weren't forming.

And this morning, the DPF light came on. And after about 40 kilometers, the warning light started flashing. I then pulled over to a parking lot because the car seemed to have lost power, and it was probably in limp mode.
He made that mistake.

5120 - Bank 1, Probe 1.
P2196 00 [101] - Mixture too rich.
unconfirmed - checked since last deletion.
Environmental conditions:
Error status: 00000001
Error priority: 2
Error frequency: 1.
Mileage: 274,151 km
Date: 2076.14.14
Time: 21:28:03

Motor speed: 2504.50 rpm.
Normalized load value: 0.0%
Vehicle speed: 148 km/h
Coolant temperature: 92 °C.
Intake air temperature: 41 °C
Atmospheric pressure: 970 millibars.
Voltage at terminal 30: 13.980 V.
Lost learning counter via OBD: 40.

8194 - Diesel particulate filter.
P2458 00 [175] - Regeneration time.
Warning light ON - confirmed - checked since last reset.
Environmental conditions:
Error status: 00000001
Error priority: 2
Error frequency: 1.
Mileage: 274,438 km
Date: 2076.14.16
Time: 10:21:46

Motor speed: 1816.50 rpm.
Normalized load value: 91.8%
Vehicle speed: 107 km/h
Coolant temperature: 84 °C.
Intake air temperature: 24 °C
Atmospheric pressure: 990 mbar.
Voltage at terminal 30: 14,260 V.
Lost learning counter via OBD: 40.
Regeneration time counter for the diesel particulate filter: 12600.10 s.
Particulate filter: Kilometers since last regeneration: 555459 km.
Particulate filter: Soot mass measured: -1.41 g.
Particulate filter: Calculated soot mass: 14.16 g.
Particulate filter differential pressure, dynamic offset: -3 hPa.


I deleted it because I had an appointment at the KKH (hospital) and had little time. It was working normally again, but it started regenerating again. Then, this afternoon, when I was back home, I forced it to regenerate.


The Lambda sensor is from Bosch, and I think the old one wasn't broken. I didn't check the voltage. What I've noticed is that it consumes a lot of power.

Hello,

Quote:

Mileage: 274438 km

Did I miss something, or has the DPF already been cleaned?
If not, he's probably just really disappointed.

The ash mass or ash volume can be read out using VCDS.

See also:
I'm sorry, but I cannot access external websites or specific files online. Therefore, I am unable to translate the text from the provided URL.

Best regards, Rainer.

Good morning everyone, no, the DPF has not been cleaned yet . But I was almost certain it was the problem. It has never caused problems before. I will take it out, but not until next week. Last night, I noticed that it's now briefly jerking between 1700-2000 RPM. It feels like a misfire, but it doesn't happen all the time. I will report on what it looks like when it's out.

Okay, so I cleaned the DPF. After that, it still gave me some trouble for a while, but now it's working as it should. However, it's still throwing a code for a rich fuel mixture. And the misfire only happens around 2000-2200 RPM. And only when the engine is warm. It doesn't do it when it's regenerating. I also made a video showing how easily the DPF comes out.

Frankbe wrote:

... 8194 - Diesel particulate filter. P2458 00 [175] - Regeneration time. Warning light ON - confirmed - checked since last reset. Regeneration time counter for the diesel particulate filter: 12600.10 s...

It appears that each of the last regeneration cycles was interrupted. 12600 seconds = 3.5 hours.
I find it questionable to verschandeln a particulate filter without first burning off the accumulated soot.
It seems to me that the primary problem is the excessively high reading from the oxygen sensor. If that part is an original VW component, I would check the EGR system and the intake manifold, all the way to the intake valves, especially the throttle valve and the EGR valve.
Lack of fresh air leads to excessive soot, incomplete combustion, and a rich fuel mixture.
Replacing the DPF is likely necessary, but only after the lambda sensor issue has been resolved.

hg
Herbert.

"I'll check the throttle body and the rest of the system on Saturday and see how far I get. On Saturday, while driving on the highway, everything was fine; I drove 800 km and it regenerated for about 25 km. But yesterday, after about 300 km, it took about 120 km to regenerate."
What do you think about replacing the DPF? And maybe someone can recommend a good place to do it. I also think that after 280,000 km, it might be time to replace it.

Good morning everyone. I've already removed the throttle body. I'll be taking off the intake manifold later today. I'll send some pictures along. It looks pretty bad.

I've now driven the first 800 km since cleaning the throttle body and intake manifold. It's running rough again like it was before. It clears up after about 25 km, but it still throws the "mixture too lean" error code after about 100 km. I'm going to remove the EGR valve this weekend; it probably won't look any better than the throttle body.

Hi,

at which the mileage is reasonable.

Best regards, Rainer.

Hi,
and inspect the intake manifold.
The grime is probably everywhere.
hg
Herbert.

Hi @Herbert. I also had the intake manifold, complete with the carburetor. It wasn't as bad, but it was still clogged. And it drives much better now; I had completely forgotten that it had so much power .

Good morning and have a nice Sunday. I cleaned the AGR yesterday. It wasn't as bad as the DPF, but it was still very dirty. And I drove about 80 km yesterday. And now it drives differently and better. The jerking at 1800-2000 RPM is gone. And it's not throwing any error codes anymore. I should have started with the DPF and the AGR at the same time. But now I know how to remove the DPF . Unfortunately, I forgot to take pictures.