Ford F85Z-9G444-AB Sensor - Hego

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When dealing with Oxygen Sensors (O2S) troubleshooting, it's essential to conduct thorough tests before attributing driveability issues to the sensor. The upstream O2S in the exhaust system provides a feedback signal to the PCM, indicating leftover oxygen levels and helping control the engine air/fuel ratio for optimal performance. The downstream O2S, while operating similarly, is used for the catalyst monitor system. A functional O2S relies on proper electrical connections, adequate air supply, operating temperature, and the use of unleaded fuel. The Electronic Engine Control (EEC) system can detect various HO2S problems, setting trouble codes for specific faults. Testing involves checking O2S signal voltage with a digital voltmeter, ensuring it ranges from 100 to 900 millivolts for both upstream and downstream sensors. Additionally, checking battery voltage supply to the O2S heating circuits is crucial. Replacement guidelines emphasize the need for care during sensor removal, including avoiding damage to the attached pigtail and electrical connector, preventing contamination, refraining from using cleaning solvents, and applying anti-seize compound on the sensor threads before installation. The removal process involves raising the vehicle, disconnecting the electrical connector, using a specialized socket for unscrewing the sensor from the exhaust manifold, and finally, applying anti-seize compound and securely tightening the new sensor before lowering the vehicle and reconnecting the electrical connector.

To replace the Mass Airflow Sensor (MAF) on 2011 models, disconnect the battery, detach the electrical connector, remove the MAF sensor, and reinstall it with a new gasket.

Checking battery voltage supply to the O2S heating circuits is crucial to ensure proper functioning of the sensor.