A malfunctioning oxygen sensor (or O2 sensor) on your Lincoln Navigator can cause your check engine light to come on or can even make your vehicle stall or die. Oxygen sensors measure the fuel-to-air ratio in your Navigator's engine. However, over time oxygen sensors can become dirty or clogged. Changing your Navigator's O2 sensor is a fairly straightforward process that does not require special skills or knowledge to complete successfully.
Bring your Navigator to a parts store and have the attendant run a diagnostic check to tell you which O2 sensor to change.
Locate the oxygen sensor you wish to change. Your 1998 Lincoln Navigator has a total of four oxygen sensors. All are located underneath the vehicle, with two on the passenger side, which run along the exhaust pipe near the catalytic converter and two on the driver's side. The two sensors on the driver's side are located near the front wheel well and near the engine block.
Loosen the two retaining bolts that hold your Navigator's O2 sensor mounting bracket in place using your socket set.
Use the end of the flat screwdriver to depress the plastic tab which holds the Navigator's O2 sensor to the connection plug and pull the sensor out.
Connect the replacement O2 sensor for your Navigator to the connection plug.
Hold the mounting bracket in place and replace the mounting bracket bolts.
