Trying to find out if my catalytic converter is bad. Problem is excessive heat from under console its starting to warm up down here in Alabama. Took it to a muffler shop and they said "JUST READ YOUR CODES" it will tell you if cats are bad. After 3 days of messing around building 2 different code readers I finally got one that works however I do not want to open up more cans of worms. I am not sure how to understand the codes as it tests several different systems.