Heated Oxygen & Oxygen Sensor Notice

WARNING: This page does not describe the selected car, but rather 249 other vehicles, including the 2004 Saturn Vue, 2004 Saturn L300, 2004 Saturn Ion Red Line, 2004 Saturn Ion 3, and 2004 Saturn Ion 2. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Do not remove this pigtail from either the heated oxygen sensor (HO2S) or the oxygen sensor (O2S). Removing the pigtail or the connector will affect sensor operation.

Handle the oxygen sensor carefully. Do not drop the HO2S. Keep the in-line electrical connector & the louvered end free of grease, dirt, or other contaminants. Do not use cleaning solvents of any type.

Do not repair the wiring, connector or terminals. Replace the oxygen sensor if the pigtail wiring, connector, or terminal is damaged.

This external clean air reference is obtained by way of the oxygen sensor signal & heater wires. Any attempt to repair the wires, connectors, or terminals could result in the obstruction of the air reference & degraded sensor performance.

The following guidelines should be used when servicing the heated oxygen sensor:

Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor causing poor performance.
Do not damage the sensor pigtail & harness wires in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor & cause performance problems.
Ensure the sensor or vehicle lead wires should not be bent sharply or kinked. Sharp bends or kinks could block the reference air path through the lead wire.
Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wired sensor may rely on this ground as the only ground contact to the sensor. Removal of the ground wire will cause poor engine performance.
Ensure that the peripheral seal remains intact on the vehicle harness connector in order to prevent damage due to water intrusion. The engine harness may be repaired using Packard's Crimp & Splice Seals Terminal Repair Kit. Under no circumstances should repairs be soldered since this could result in the air reference being obstructed.