Error code P2002 Passat 2.0 TDI BMR

Hello, I have the following vehicle:
Passat, manufactured in 2008, 2.0 TDI engine, 125 kW, engine code BMR.
with the following problem:
Error code P2002 read, error cannot be cleared, even with the ignition on and the engine off.
Read measurements, pressure difference 180 mbar at idle. DPF chemically cleaned after a reading of 12 mbar at idle, but the error persists. Measured values compared: EGR, exhaust temperatures, coolant temperatures, lambda values, air mass, fuel injection deviation. No values outside the tolerance range.
Pressure difference sensor replaced and adjusted.
Oxygen sensor replaced.
Exhaust gas temperature sensor 2 replaced.
All learning values have been deleted, but the error persists.
A regeneration trip is not possible because there is an error in the control unit.
"When exhaust temperature sensor 2 is disconnected, the P2002 error code can be cleared, and it doesn't reappear during the drive. Only the error code related to exhaust temperature sensor 2 appears (by disconnecting the connector from the sensor). As soon as the connector is plugged back in, the P2002 error code immediately reappears."
Software updated with new data, but the error persists.
Exhaust gas temperature sensor, Lambda sensor, Pressure differential sensor, DPF temperature sensor 1 & 2, Mass airflow sensor. The pins of the sensors to the pins of the connector on the control unit have been checked for continuity - OK. The individual pins of the sensors to each other have been checked for continuity - OK (meaning no continuity).
Does anyone have any other ideas or perspectives?

Hello,

What is the meaning of this sentence? Did you verschandeln the DPF after there was a pressure difference of 12 mbar at idle?

Quote:

The DPF has been chemically cleaned to a value of 12 mbar at idle

.

Apart from that, it's hard to imagine a "chemical" cleaning or the use of extremely aggressive substances.
Typically, the cleaning process involves burning off contaminants and then backwashing.

Perhaps the DPF is now completely blocked (= broken). Compare the differential pressure under load with...
Okay, I'm ready. Please provide the German text you want me to translate.

Best regards, Rainer.

Regards,
There was a typo; it should have said 12 mbar.
Yes, I can do that. Please send me the values so I can take a look.
But then I should be able to clear the error code when the ignition is on and the engine is not running, but the error code cannot be cleared when the ignition is on. If it's mechanically broken, you wouldn't be able to detect it with the engine off.

Hi,
If the error is detected during the ignition process, it cannot be cleared.
Suggestion: Perform a car scan and post the results here.
and then enter the measured values for the DPF when the ignition is on, specifically the pressure difference and offset.
hg
Herbert.

Here are the initial data.

Log trips.
MKB: BMR, Stage No.: 03G906018EM
1015.7 mbar atmospheric pressure.
19.5°C outdoor temperature.
Software series.
246,000 km

The pressure difference across the particulate filter is too high.

dieselschrauber wrote:

The pressure difference across the particulate filter is too high.

Wow, is it possible that the patient is even exhibiting a leading pressure differential? Over 630 mbar with a target of <=300 is already quite remarkable. Have we discussed this before in this forum?

Second | Upm | Differential pressure - particulate filter [mbar]
0.65 1714 64.3
1.37 1758 87.5
2.07 1861 128.8
2.79 1983 153.5
3.49 2123 187.0
4.21 2281 231.6
4.92 2422 275.7
5.66 2574 298.8
6.36 2725 324.7
7.07 2862 355.6
7.78 3006 389.1
8.51 3149 419.4
9.21 3271 441.4
9.92 3393 465.6
10.63 3513 489.8
11.36 3622 510.8
12.08 3737 529.5
12.80 3848 558.1
13.50 3941 568.6
14.24 4040 587.9
14.94 4129 612.6
15.65 4223 630.8

Hi,
"However, the pressure difference when the ignition is on seems correct. But I can't clear this error code, as it can only be cleared when the exhaust temperature sensor is faulty. And in that state, with just the ignition on, it doesn't detect the pressure under load. The pressure difference is also okay when the engine is idling, and the error code still can't be cleared. Even if I install a new DPF, my values will be correct when the ignition is on and when the engine is idling, but I still won't be able to clear the error code."

Hi,
There might be two issues: excessive pressure difference under load, and a fault in the ignition system check.
If it's not the differential pressure sensor, perhaps there's something wrong with the ambient pressure sensor (always reading 1016 mbar?)?
If a substitute value is used for the measurement, the DPF monitoring will also be inaccurate.
hg
Herbert.

today, 1014 hPa atmospheric pressure.

Hi,
The value of the (soot) loading coefficient, at 20%, may be blocking the process because it leads to a decision and storage of a non-reversible regeneration.
The type of cleaning was, let's just say, a bit peculiar. Despite this, there are two possible options, or a combination of them: increasing the ash content and forced regeneration.
hg
Herbert.

Good morning, the cleaning was done using a cleaner and rinse from Liqui Moly, and so far it has always worked.
I'm going to try increasing the value. I think it might also be because it's not ending the regeneration process or setting it as successful.

AW wrote:

Good morning, the cleaning was done with a cleaner and rinse from Liqui Moly, and so far it has always worked. I will try increasing the value, and I think it might also be because it doesn't complete or successfully set the regeneration process.

Okay, bitte gib mir den deutschen Text, den du übersetzt haben möchtest.
Okay, I'm ready. Please provide the German text you want me to translate.

AW wrote:

... the cleaning was done with a cleaner and rinse from Liqui Moly, and so far, it has always worked

. For whom?

AW wrote:

In my opinion, it's also because he doesn't end or mark the regeneration process as complete.

That was exactly my thought.
hg
Herbert.

Okay, so raising the ash mass didn't solve the problem; it's the same issue as always, and the error can't be cleared.
I connected a different pressure differential sensor and left it exposed to the air so that it always measures a difference of zero. After approximately 5 km, the lamp turned off on its own, and the error could be cleared. It was then properly reconnected, and the error remained gone. A regeneration process was initiated and successfully completed. A test drive was performed, but the pressure difference under load was still 430 mbar.
But the car is currently running without any issues.