SEARCH  Sensors  Ambient Air Temp  Oxygen  Potentiometer  Wheel Speed Oxygen Sensor Motorcraft® Oxygen Sensors: Are designed to meet Ford Motor Company requirements for durability and emissions performance Are designed specifically to work with the electronic systems in Ford, Lincoln and Mercury vehicles Why an Oxygen Sensor May Fail As an oxygen sensor ages, contaminants from poor fuel quality or oil may accumulate on the sensing element, reducing its effectiveness The oxygen sensor may also fail prematurely if contaminated by coolant leaks, certain silicone sprays, over-the-counter fuel additives or gasket sealers Related Components to Check Electrical connections to and from the oxygen sensor Engine control computer Catalytic converter Distributor and distributor cap Spark plugs Vacuum leaks upstream of the oxygen sensor Fuel injectors Mass air flow sensor Exhaust gas recirculation (EGR) valve Search all Motorcraft® sensor product numbers and descriptions.