I have a 99 escort, 133,000 miles. Check engine light came on and has been on for a week. When the car has been driven a while there is a burning smell coming from the engine compartment. One time I saw a puff of smoke come out from under hood while at a stop light. Operating temp is in the normal range. I had a friend check the code and it was "P0420". Something about the catalytic converter, but he didn't know what it meant. He reset the service engine light and the smell went away. Any ideas?
Thanks Dave