2009 Chevrolet Tahoe Catalytic Converter

You need to open the hood, remove the oil fill cap, place an oil drain pan under the oil pan drain plug, remove the oil pan drain plug, allow the oil to drain completely, clean and inspect the oil pan drain plug, replace if necessary, clean and inspect the oil pan sealing surface, replace the oil pan if necessary, wipe any remaining oil from the drain plug hole and reinstall the oil pan drain plug until snug, position the drain pan under the Oil Filter, remove the oil filter and ensure that the oil filter gasket is still on the old filter if not, remove the oil filter gasket from the oil pan.

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. You 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 need to ensure the sensor or vehicle lead wires are not bent sharply or kinked and 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. Then you need to ensure that the peripheral seal remains intact on the vehicle harness connector to prevent damage due to water intrusion.

You need to remove the rocker arm cover, the number one cylinder spark plug, the rocker arm bolts, the rocker arms, the rocker arm pivot support, and the Pushrods and clean and inspect the rocker arms and pushrods.