here we will try to describe the typical error patterns / problems that these vehicles get with the immobilizer.

These always have the effect that the ignition cannot be switched on and the car does not start.
In the VW Phaeton, the main cause is the Kessy control unit, which gets water damage.

The devices are installed under the carpet in front of the driver’s seat and like to get a portion of water too much via clogged sunroof drains or clogged drains in the water tank (in front of the windshield).
This then has the effect that the keyless control unit outputs an error or even fails completely.

Here is the possibility that you send us the defective device and we try to read out the data from this device to then program a device with the same spare part number.

After that, the replacement device can then be installed in the vehicle plug and play, which means without any additional coding work.

The old keys are recognized, the steering column locks and unlocks again as usual and the ignition can be switched on.

We usually need one business day to recover the data and code the new device.

Unfortunately, however, consequential errors can also occur. Since the Kessy control units also control the starter relay. If they are submerged in water, the starter motor may rotate permanently (without the car starting), causing damage.

Another fairly common problem is a defective steering column lock.

From time to time, however, the keys break and need to be replaced, but here we can usually offer replacements.

If you have any questions, please use the contact form.