You should take care when handling the HO2S and the
Oxygen Sensor (O2S), keep the in-line electrical connector and the louvered end free of grease, dirt, or other contaminants, and avoid using cleaning solvents of any type. Then, you should turn the ignition off, raise and support the vehicle, disconnect the HO2S electrical connector, and remove the HO2S wiring harness from the transmission case and the HO2S.