Ford 2.5L Index of Articles

Rear O2 Sensor Heater Test (1998-2001 2.5L Ford Ranger)

Rear O2 Sensor Heater Test (1998-2001 2.5L Ford Ranger)

Testing the heater element of the rear oxygen sensor (HO2S 12) is not difficult on the 1998, 1999, 2000, and 2001 2.5L Ford Ranger or Mazda B2500. In this tutorial I'll explain how to test it to find out if its bad or not in 3 easy...   read more >>

How To Test The Front O2 Sensor Heater (1998-2001 2.5L Ford Ranger)

How To Test The Front O2 Sensor Heater (1998-2001 2.5L Ford Ranger)

In this tutorial I'll explain how to test the front oxygen sensor (HO2S 11) heater on the 1998, 1999, 2000, or 2001 2.5L Ford Ranger and Mazda B2500 pickup truck. When a trouble code P0135 pops up and illuminates the check engine light on your...   read more >>

Oxygen Sensor Circuit Diagram (1998-2001 2.5L Ford Ranger)

Oxygen Sensor Circuit Diagram (1998-2001 2.5L Ford Ranger)

This is the typical circuit diagram of the front oxygen sensor (HO2S 11) of the 1998, 1999, 2000 2.5L Ford Ranger and 1998-2000 2.5L Mazda B2500. The front O2 sensor (HO2S 11) is located before the catalytic converter on the exhaust pipe. You...   read more >>

Ignition System Circuit Diagram (1998-2001 2.5L Ford Ranger)

Ignition System Circuit Diagram (1998-2001 2.5L Ford Ranger)

This is the typical ignition system wiring diagram for the 1998, 1999, 2000, and 2001 2.5L Ford Ranger and Mazda B2500. The ignition system is made up of two ignition coil packs and the engine has a total of 8 spark plugs (4 on the exhaust...   read more >>