britagnek

2 questions. The first being where is the O2 sensor located on the 93 F250's? The second question is my check engine light comes on and goes off frequently when driving. I know with other vehicles there is a diagnostic port or a jumper port which is usually located underneath the dash on the driver side but I have looked and no luck. Can anyone tell me if there is one and if so where would it be located?

f250lover

Not sure about the o2 sensor but pre 95 vehicles are OBD 1, meaning on board diagnostic system 1, they do not have the connector. There's usually a connector under the hood that you can jump to make the engine light blink, then by counting the blinks you can cross reference the numbers and get your codes. Use a shop repair manual such as haynes. It should have complete directions.