Ford 3S4Z-9F472-CA Sensor - Hego

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There are two oxygen sensors in the vehicle, one before and one after the catalytic converter. The first sensor is of the heated type, allowing for more efficient monitoring of the exhaust gas and a faster response time. To remove the sensor, the heat shield securing bolts need to be removed, and the wiring plug should be disconnected. The second sensor, if present, is located under the oil pan in the exhaust pipe. Care should be taken to avoid contact between the wiring and hot exhaust components. The sensor can then be unscrewed and removed, ensuring it is not dropped or damaged. When installing the sensor, it may be beneficial to clean it if the tip appears contaminated, but caution must be taken to avoid damaging the tip. Anti-seize compound should be applied to the sensor threads before tightening it to the specified torque. The wiring should be reconnected, ensuring it is routed away from hot exhaust components. To verify the sensor is working, exhaust emissions can be checked and compared to the specified figure. It is important to note that a faulty sensor may have generated a fault code, which should be addressed to ensure proper engine management.