You should not apply contact cleaner or other materials to the sensor or vehicle harness connectors. And do not damage the sensor pigtail and harness wires in such a way that the wires inside are exposed. And ensure the sensor or vehicle lead wires are not bent sharply or kinked. Do not remove or defeat the
Oxygen Sensor ground wire, where applicable. Lastly, ensure that the peripheral seal remains intact on the vehicle harness connector to prevent damage due to water intrusion.