Thanks for all your imput. The service dept. put the 98 Cady on the code reader, and every time they worked on it, it gave another code. You are right, the service engine light still comes on. I found on the internet, that by removing the neg, batt. cable, it would wipe out the codes. Well yes it did. However, now I get "Check gas cap". I bought a new Cady gas cap, took it to the service dept. had them wipe out the code, and put on the cap. That lasted about 50 miles, then the light came on and said "Check gas cap. I unhooked the batt. cable, removed the gas cap, and reinstalled it. Hooked up the batt. cable, and so many miles the light came on, saying "Check gas cap" Now I am going to talk to a friend, who works in the Chevy dealer, but did work many years at the Old's dealer. He want to check it out, and he isn't going to charge me. I didn't take it to him in the first place, because he is not working as a mech. now. He is in management. This is my first Cady, and I like it very much. I have had many new cars, but this Cady is a dream of a car. (less the engine light problem) As I can only afford 1 car payment, I opted for a Dodge deisel 3/4 ton long bed, 4x4. The Cady is the wifes car. Thanks again. Javahjoeo from Kokomo