I was driving home today and when I slowed for a stop light I felt what seem to be the engine shaking. I pulled over and popped the hood, my catalytic converter was glowing red. I am guessing fuel is either too rich or too lean and caused the cat to mess up. Is there a free download for VAG-COM so I can get the code? I have a laptop and the cable. If not any idea who sells it the cheapest?