How to troubleshoot a faulty reverse light on an Audi A2?

My Audi A2's reverse light is no longer working. How can I diagnose and fix this issue?

First, check the fuse for the reverse light. If it's blown, replace it and see if that solves the issue. If not, check the wiring and connections to the reverse light bulb. If everything appears to be in good condition, the issue may lie with the reverse light switch. Consider taking it to a mechanic for further diagnosis and repair.