How to fix a faulty ignition switch in an Audi 80?

I am having trouble starting my Audi 80 and I suspect it may be due to a faulty ignition switch. How can I diagnose and fix this issue?

First, check the battery and ensure it is fully charged. If the battery is not the issue, then the next step is to check the ignition switch itself.

To diagnose the issue, you can use a multimeter to test the continuity of the switch. If there is no continuity, then it is likely that the switch is faulty and needs to be replaced.