How to diagnose and repair a faulty ignition coil in an Audi 80?

I've been experiencing engine misfires and reduced performance in my Audi 80. After some research, I suspect a faulty ignition coil. How do I properly diagnose and replace it?

The first step is to determine which cylinder is experiencing the misfire. This can be done with an OBD-II scanner or by manually checking the spark plugs. Once identified, the ignition coil for that cylinder can be tested with a multimeter. If it fails the test, it will need to be replaced.

Before replacing the ignition coil, it's important to check the ignition control module and spark plug wires for any potential issues. If everything else checks out, the ignition coil is likely the culprit and should be replaced with a high-quality OEM or aftermarket part.