It's covered by a small removable plastic panel in the lower area of your dash , below the steering wheel , between your hood release and the parking brake release
The scan port is usually located under the dash, near the steering column. It may be visible, or behind a small cover that can be removed.
Fuse # 3 is a 20 amp fuse for the OBD II scan tool connector and the cigarette lighter
Click on the link below Click on Tech Library Scan down to " lowering suspensions "
A 2.9 Ford Ranger NEVER has much power, but if it's lower than normal, try running a computer diag scan to see if the computer has picked up something.
My 1995 Ford Explorer has an ( EEC TEST ) connection in the engine compartment by the power distribution box AND a ( data link connector ) behind a small removable plastic panel in the dash , below the steering wheel , between the hood release and the emergency brake release handles
Trouble code P0000 means: No fault found
By hooking up a OBD2 scan tool to the diagnostic port under the dash on the driver's side.
Not entirely sure what you mean by this but assuming you mean a brute force port scan. Answer is no, you can scan a port directly, no need to scan every port on a system (brute force).
Click on the link below Click on Tech Library scan down to " Computer " EEC IV diagnostics
There are a lot of sensors that can trip the engine light, you would have to scan it to know which one is causing the error
Take it to Autozone (or your local parts store) and they will connect the scan tool to your truck, then you will press reset.
According to the Owner Guide , fuse # 3 is a 20 amp fuse for the OBD II scan tool connection and cigarette lighter on a 2002 Ford Expedition