Check Engine Light

[RYanmas9]

Hello all,
I'm at work and after I get off Im going to go have the code read, but I figured since I have nothing else to do Id throw this out and see if anyone has an idea.

I have a 2002 F-250 6spd 4x4. There is no check engine light when I start the truck. Once I drive for awhile and the engine gets up to temperature the check engine light comes on. Then once she is shut off and cools off it turns back off. I replaced the thermostat, temperature sensor and the fuel filter just as my regular maintenence, but that still didn't fix it. Anyone have an idea off the top of their heads?

[ttyR2]

Rent an OBD2 scanner and pull codes.

[RYanmas9]

Like I said, I am at work right now. After I get off thats what I am going to do. I wanted to see if anyone had any quick ideas on what it might be until I get off

[ToMang07]

Originally Posted by ttyR2

Rent an OBD2 scanner and pull codes.

That most likely wont work, because generic OBDII scanners won't work on these trucks. You need a better scanner.