I have a 1989 F-250 with a 460 engine. Check Engine light comes on after I drive for awhile. Had it checked and was told to replace the Oxygen Sensor, but I cannot find it on the truck checked entire exhaust and nothing, any ideas or suggestions

 

I didn't go look, but I don't think my 88 has one, maybe the same for the 89.

 

Check your exhaust system stem to stern. If there is anything screwed into it with wires coming out of it after the exhaust manifold (the part that bolts to the cylinder head), that's your oxygen sensor.

Jason

 

Any 88+ ford truck will have one.

On the 460, it is in between the two pipes, on the top side, just before they merge into the cat.

 

Great description! My 1992 F350 w/5.8L engine has the oxygen sensor in the location mentioned above.