Golf 6 AGR error after rodent damage

Hi everyone,

This forum is now my last hope for fixing the problem without having to go to an expensive repair shop.

My Golf 6 Plus, manufactured in 2010, with a 2.0L TDI engine producing 102kW, and a mileage of 130,000km, has an AGR (Abgasrückführung) error in the engine control unit, which occurred after rodent damage in the engine compartment (vacuum hoses were chewed).
- P040300 (4891) - VAG Text: Malfunction of exhaust gas recirculation valve.
- P040300 (4892) - VAG Text: Malfunction in exhaust gas recirculation valve.

The vacuum hoses were then replaced in the workshop.
Since that didn't work, the solenoid valve (1K0 906 283 A) was replaced out of desperation.

Now, here's the strange part:
The error is dependent on temperature and humidity.
In the summer, there are no problems, and neither are there any issues in very cold temperatures (below 3°C).

During the transitional period, especially now with the high humidity, the error is almost constantly present.

Now, here are my actual questions:
- Does anyone in this forum have experience with the AGR function, specifically with diagnostics? Could my vehicle potentially have a defective or blocked AGR module? Or would the error message then be permanently displayed and not dependent on the humidity?

- I suspect that the weasel not only gnawed on the vacuum hoses, but also on other cables, and that's what's causing the malfunction. Do you have any tips for me on how to test the functionality of different types of connectors (e.g., by measuring resistance, voltage, etc.) and what conditions they should be in before testing?

The insurance company is refusing to pay for the examination. The workshop wants to strictly follow the troubleshooting flowchart and replace the AGR module "and then see if the problem is gone" .

Thank you to everyone who has taken the time to read this .
I hope.

Hi,

"Why don't you use the search function?" I suspect there's a problem with the position feedback from the EGR valve, possibly due to a damaged cable or a faulty connector.

Best regards, Rainer.

Under https://www.motor-talk.de/forum/agr-fehler-abhaengig-von-der-aussentemperatur-t6239879.html?page=1, someone had the same problem. Apparently, the AGR module was actually defective (or at least the error disappeared after the replacement).

I used the search function and also checked some posts regarding... AGR found.
I'm looking for a wiring diagram for the 2.0 TDI engine that shows which cables connect to the position sensor, or information about the sensor's resistance value / how to perform an input/output (IO) test on it, but not how to replace it.

Are there such information available on this forum, and am I just too inexperienced to find the posts?

Hi,
There is no general wiring diagram for 2.0 TDI engines; they are always vehicle-specific and can be obtained from Erwin (siehe Fehlerdatenbank).
In the current case, I would examine the cables and connectors leading to the AGR module, one by one.
hg
Herbert.