Toyota 89465-0C190 Oxygen Sensor

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When servicing an oxygen sensor or air/fuel ratio sensor, it is important to exercise special care. These sensors have a permanently attached pigtail and electrical connector that cannot be removed, so any damage or removal of these components will ruin the sensor. It is crucial to keep grease, dirt, and other contaminants away from the electrical connector and the louvered end of the sensor. Cleaning solvents should never be used on these sensors, and they should not be dropped or roughly handled. Additionally, when replacing the sensors, it is necessary to install the silicone boot correctly to prevent melting and ensure proper operation. There are four oxygen sensors in total, with one upstream sensor and one downstream sensor for each cylinder bank. The upstream sensors are located at the outlet ends of the exhaust manifolds, while the downstream sensors are situated in the front exhaust pipe assembly. To replace the sensors, the ignition key should be in the OFF position, and the vehicle should be raised and securely placed on jackstands. The upstream sensor can be unscrewed with a wrench, while the downstream sensor requires either an oxygen sensor socket or a special socket. Anti-seize compound should be applied to the threads of the sensors to facilitate future removal, although most new sensors already have this compound applied. The installation process is the reverse of removal.