VW Polo 6N2 Won't Start - WFS Error Codes

Hello,

Car: Polo 6n2 (AMF 1.4 TDI)

After an alarm system was installed, which required removing the steering column cover, the engine will no longer start.
The starter relay is not responding at all. After some time, the "warning" light flashes, and there is a beeping sound 3 times.
Attempts were made to start the vehicle using the plastic key (is that even possible?), as well as with a potentially faulty key (transponder). Therefore, there may be an error entry (incorrect key) or a wiring defect.

VAG-COM says:
Engine control unit:

Code:

2 Faults Found: 17978 - Engine Start Blocked by Immobilizer             P1570 - 35-10 - - - Intermittent 18044 - Powertrain Data Bus: Missing Message from Airbag Controller             P1636 - 35-10 - - - Intermittent Readiness: N/A

These errors can be deleted, but they reappear immediately.
The WFS service also had 3 error messages, but I was able to permanently delete them.

The cable between the reading coil and the control unit seems to be okay, but new cables have been installed in that area (potential source of error). The airbag control unit indicates that all 4 airbags are functioning correctly. No other errors are present.

Thank you for any help!

Greetings, Moritz.

Hello,

According to the instructions, the plastic key should also work.

I now suspect that it's likely a faulty ignition switch (the active WFS probably only engages after the engine starts). Can this be checked with VAG-COM?

Greetings, Moritz.

If it is indeed your Polo .

What exactly is the WFS-Stg? WFS is integrated into the speedometer/MSG!

Do you already know how a WFS (Web Feature Service) works?


P.S. Questions like these are generally not welcome here!

I also think that it would have to start first before immediately shutting off. Perhaps the connector on the ignition switch has come loose, or a cable may have broken. Or, the action of trying to start it may have triggered a defect in the already unstable part.
Okay, or maybe I'm wrong... You just have to check if everything is working correctly, like verifying the proper connection of a 50-amp breaker to the magnetic contactor, for example.

What exactly is the WFS system? WFS is integrated into the speedometer/MSG!

Yes, in vehicles like the T4 and Polo, there is an external WFS-SG (Vehicle Functional Safety System - Security Gateway) that contains the key data. Just like the speedometer in other vehicles. The Polo, like the T4, can operate without a speedometer because other systems rely on the key data stored within it .


So, nothing about the speedometer in this case .

Hello,

Thank you very much for the tip about terminal 50 - teileklaus! I just measured the ignition switch and discovered a loose connector under the fuse box (easily accessible). So, if there's a "Hall of DAU"...
Thank you also to mullemaus/3phasenbiber for the answers.

Greetings, Moritz.