I've got an '01 C4 with 41K miles. Suddenly the check engine light comes on when the gas is about half empty. After I fill the tank it goes off. I have checked the gas cap, made sure it's closed tight.
Thanks for the reply. I'm going to check around and see if I can find somewhere to get the code(s) read without big bucks. My local Porsche shop wants $95. to read it.