2005 Chevrolet Blazer Oxygen Sensor

You need to remove the oil pan drain plug and drain the engine oil into a suitable container, remove the Oil Filter from the oil filter adapter for 2WD vehicles, open the access panel in the steering linkage shield for 4WD vehicles, and remove the oil filter from the remote oil filter adapter, then inspect to ensure the engine oil filter gasket is removed.

You need to position a suitable container to catch the engine oil, remove the oil filter, remove the Oil Filter Adapter, remove the oil filter bypass valve, and clean and inspect the valve bore for damage.

You need to clean the Throttle Body bore and the throttle valve plate using a clean shop towel with GM Top Engine Cleaner, P/N 1052626, or an equivalent product.