2005 Buick LeSabre Oxygen Sensor

You should raise and support the vehicle, position the oil drain pan under the engine oil drain plug, remove the engine oil drain plug, clean and inspect the engine oil drain plug, repair or replace if necessary, clean and inspect the engine oil drain plug sealing surface on the oil pan, remove the Oil Filter and clean and inspect the oil filter sealing area on the oil filter adapter, and repair or replace if necessary.

You should remove the fuel injector sight shield, remove the MAP sensor, press the access cover down and rotate 1/4 turn counterclockwise, remove the access cover and remove the PCV Valve and the O-ring from the intake manifold.

You should remove the left valve rocker arm cover, remove the right valve rocker arm cover, remove the valve rocker arm pedestal retaining bolts, remove the pedestal, remove the rocker arm assembly and the Pushrods, clean the bolts of all thread adhesive and clean and inspect the valve rocker arms and pushrods.