How to Fix a Non-Functioning Headlight in an Audi A4

My Audi A4's headlight is not turning on, even after I've changed the bulb. What could be causing this issue and how can I fix it myself?

First, check the fuse for the headlight to make sure it is not blown. If the fuse is fine, then it could be a wiring issue. Try tracing the wires and checking for any damage. If the wiring looks fine, it could be a faulty headlight switch. In that case, it's best to take it to a mechanic for proper diagnosis and repair.

It could also be an issue with the headlight relay. This can be easily replaced by purchasing a new one and swapping it out. If the headlight still doesn't turn on, it might be a problem with the headlight control module. Again, it's best to have a professional take a look at it.