How to troubleshoot a faulty ABS sensor in an Audi A2?

I recently noticed that my Audi A2's ABS warning light is constantly on. What could be causing this issue and how can I fix it?

One possible cause could be a damaged or malfunctioning ABS sensor. It is recommended to have the sensor tested and replaced if necessary.

Check the wiring and connections of the ABS sensor. Loose or damaged wires can also cause the ABS light to come on. Make sure everything is securely connected and replace any faulty wiring.

Another possible cause could be a faulty ABS module. In this case, it is best to have a professional mechanic diagnose and repair the issue.