The "service engine soon" light is came on on my 2K1 SE yesterday. I tightened the fuel cap, but the light stays on. MAF sensor is seated tight. Any thoughts on what else to check?

 

Check out AutoZone. Have them check out your car for free. Come back to us with the report. Then, only then, will we help you... grasshopper.

 

O2 sensors.

 

The same thing happened to my Max yesterday. I was on the interstate when suddenly this big rig slows down in front of me so I shifted into third and punch it to change lanes when suddenly my SES light comes on. When I got home I disconnected the battery terminals for a while and after reconnecting them, the light goes off. I guess if something is wrong, it'll come on again but so far so good.

 

Went to a dealer this am, and yes it was the o2 sensor. They are ordering the parts (two new o2 sensors - the ones after the cat). They'll do the install, and burn updated software into the ECU next week. Glad I've got six months left on the warranty!