Not very familiar with the Mk 8... but most of the speed sensors on any modern vehicle have a plug that disconnects from the wiring harness going to each wheel.
The other end of the sensor typically mounts behind the rotor and picks up a signal from a "tone ring" that is mounted inside the back of the rotor.
So unless something is messed up with the wiring... you should be able to buy a new speed sensor at your local parts store... and swap it out.
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