Why is my Audi 80 not starting when I turn the key?

My car won't start when I turn the key in the ignition. The lights and radio all work, but the engine won't crank. What could be causing this and how can I fix it?

One possibility is that your battery has died or is not making a good connection. Try jumping your car with another vehicle or use a battery charger to see if that helps. You may also need to clean your battery posts and connectors to ensure a proper connection.