The sensitive oxygen sensor should be handled with special care and should not be taken off since it has a permanently attached pigtail and connector that can damage or cause harm to its functioning. The electrical connector and the louvered end of the sensor should not be kept near grease, dirt, or any other contaminants and cleaning solvents of any type should not be applied to it. The sensor is not to be dropped or touched carelessly, the silicone boot must be placed in a proper location in order to avoid melting and have a proper functioning. The sensor is in the exhaust manifold and it is available at the engine compartment. To ease the process of removal, use the engine until it reaches a minimum temperature of 120°F (48°C). Unplug the electric cable on the oxygen sensor, record the location of the silicone boot, and reverse the oxygen sensor out of the exhaust manifold and ensure that one does not apply too much force as it can break the thread. Test the oxygen sensor to ensure it is not damaged, and put some special anti-seize compound on the threads to help in their removal later this compound is normally applied before the oxygen sensor is fitted but in cases where an oxygen sensor is disconnected and then reconnected, the thread must be coated with this substance. Lastly, screw in the sensor and fix it, and reconnect the electric wire.