Federal Models

PURPOSE
The Fuel Injection System on this vehicle uses two Oxygen Sensors to monitor the oxygen content of the exhaust gases. The Engine Control Module (ECM) uses the voltage signal from the Oxygen Sensors to assist in determining proper Air / Fuel mixture to maintain optimum performance and economy in all driving conditions.

OPERATION
A measureable voltage is generated by comparing the amount of oxygen in the exhaust gas with the amount in the ambient air. The sensor operates only within a certain temperature range of approximately 285 - 850°C (545 - 1530°F). The exhaust gases reach the outer surface of the sensor tip via the openings in the protective sleeve. Ambient air reaches the sensor's inner surface via channels. The difference in oxygen content produces a voltage read by the ECM.