Fehlercode P2002 Passat 2.0 TDI BMR | Posts 16+

Hi,
I'm already surprised by the result. I would have expected a new error to be logged if there was a lack of differential pressure.
A forced regeneration should also have worked.
Is there any background information (e.g., DPF optimization in the MSG)?
hg
Herbert.

Morning,
The car is completely standard, and the software has also been updated (in an attempt to fix the problem, but without success).
It seems the error will persist because it cannot measure the difference, but it works without errors when started and run only once.

Okay, I've now watched the video about the Liqui Moly DPF cleaner and flush. It demonstrates how to use the product.

Liquids are sprayed into the DPF. In the video, nothing is removed from or drained from the filter. After that comes the statement,
The *Russian* in the filter will be "dissolved and distributed within the filter" so that it can be "burned off" during the subsequent regeneration .

In no part of the video is it claimed that the ash accumulated in the filter will be removed. (Why would that be?)

From the statement of the OP:
"Good morning, the cleaning was done with a cleaner and rinse from Liqui Moly, and so far it has always worked."

I understand that the filter has already been treated multiple times with this method using liquids.

The ash is still there; after almost 250,000 km, the filter is probably simply full.

This cleaning process holds about the same significance for me as treating cancer with homeopathic remedies.

Best regards, gnash.

Oh, it's amazing what you can sell to people.

The collected ash, which consists of soot removed from the engine oil through filter regeneration, originates from the additives and alloys used in the motor oil.

Just to mention the alkaline earth metals... you can add anything you want to them, but they won't dissolve.

But if you get to market something like that, it's fantastic. And then, you could add a magnet around the fuel line to save 10% fuel afterwards.

I wholeheartedly agree with the previous speaker's "Globuli" theory. Go forth, your faith has helped you.

Hi,
I had previously considered the manufacturer to be reliable, especially considering all the additional products they offer.

Herbert.

Hello, this is Michael.

I would like to address the topic of P2002 again.
I also have a Passat B6, model year 2007, with a BMR engine and 265,000 km on the odometer.
I'm experiencing the exact same problem as you. The preheating system warning light is blinking, and error code 2002 cannot be cleared. Your tip about disconnecting the plug from the temperature sensor 2 works for me too.
How exactly did you fix the problem, by replacing the differential pressure sensor? Or have you changed anything else?
In your description, it says: "I connected a different sensor and drained the hoses." Were they still connected to the old sensor, or were they just lying around in the engine compartment?

Greetings from Trier.
Michael.

Hello Michael,
Just in case the original poster doesn't respond again after a long period of inactivity: The differential pressure sensor is a known issue and doesn't cost much to replace. I would swap that one out.

At the same time, I would like to perform a logging session similar to what the original poster did on page 1. Specifically, I want to record the differential pressure at full load across the entire RPM range. If I also get similarly strange values, then the filter might simply be clogged. Then it needs to be purged once (possibly with the sensor disconnected to clear the error, followed by a forced regeneration) and then backflushed to remove all the ash.

Regards,
Guste.

Hello Guste,

First of all, thank you for the quick response.

I saw that the sensor doesn't cost much, and I was already planning to order one. However, I've read so many times that it has been replaced, but without success.
When I disconnected the hoses from the sensor, I used a compressed air gun and blew air towards the sensor, and it registered the change.
So, he's measuring it. Does it measure, but inaccurately?

For your information, I use Delphi's diagnostic software, not VCDS, for diagnostics.

(If necessary, clear the error code with the sensor disconnected and then force a regeneration.)
Are you talking about disconnecting hoses and just leaving them hanging freely in the engine compartment, and then driving?

Regards,
Michael.

Is there a solution to your problem? I'm currently struggling with the same issue.