2009 Chevrolet Suburban 1500 Oxygen Sensor

You should remove the right wheelhouse liner, remove the connector position assurance (CPA) retainer, disconnect the HO2S electrical connector from the engine wiring harness electrical connector, remove the HO2S clip from the engine wiring harness and remove the HO2S.

You should coat the threads with anti-seize compound GM P/N 12377953, or equivalent, install the heated oxygen sensor (HO2S), connect the HO2S electrical connector to the engine wiring harness electrical connector, install the CPA retainer, install the HO2S clip to the engine wiring harness and install the right wheelhouse liner.

When replacing the HO2S, you need a code clear with a scan tool, regardless of whether or not a DTC is set. HO2S heater resistance learning reset with a scan tool, where available and you should perform the above to reset the HO2S resistance learned the value and avoid possible HO2S failure.

Contamination of the oxygen sensor can result from the use of an inappropriate RTV sealant (not oxygen sensor safe) or excessive engine coolant or oil consumption. You should remove the HO2S and visually inspect the portion of the sensor exposed to the exhaust stream to check for contamination. If contaminated, the portion of the sensor exposed to the exhaust stream will have a white powdery coating. Silicon contamination causes a high but false HO2S signal voltage (rich exhaust indication). The control module will then reduce the amount of fuel delivered to the engine, causing a severe driveability problem. Eliminate the source of contamination before replacing the oxygen sensor.

You can not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor causing poor performance, and can not damage the sensor pigtail and harness wires in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems. You should ensure the sensor or vehicle lead wires are not bent sharply or kinked. Sharp bends or kinks could block the reference air path through the lead wire. You can 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 with the sensor. Removal of the ground wire will cause poor engine performance. You should ensure that the peripheral seal remains intact on the vehicle harness connector to prevent damage due to water intrusion.