2005 Buick Rainier Oxygen Sensor

You should remove the oil fill cap, raise the vehicle, remove the oil pan drain plug and drain the oil into a suitable container and the Oil Filter using a suitable wrench and inspect the old oil filter to ensure the filter seal is not left on the engine block.

You should raise and support the vehicle and remove the Radiator support shield mounting nuts and bolts and the radiator support shield.

You should remove the resonator assembly and the evaporative emission (EVAP) canister purge line from the Throttle Body, disconnect the throttle body electrical connector, remove the throttle body assembly retaining bolts and the throttle body assembly and the gasket from the intake manifold and clean the gasket surface.