The oil pump on a Volkswagen is generally located in the bottom of the engine just inside the oil pan, where it is responsible for continuously pumping the supply of oil through the engine. If the oil pump stops working, oil pressure can drop and the engine can experience catastrophic damage if it continues to run without proper lubrication. Replacing the oil pump on most VWs is relatively straightforward, though the difficulty level depends on the particular model of VW.
Raise the front of the vehicle with a floor jack and lower it onto a pair of jack stands located under either side of the car. Ensure that the vehicle is properly and safely supported before working under it.
Place an oil drain container under the oil pan. Loosen and remove the oil drain plug with a wrench. Drain the oil into the container. Save the oil for reuse later or dispose of it if you are going to be putting in new oil, which is recommended.
Remove anything that is in the way of accessing the oil pan for removal. Remove the bolts located around the perimeter of the oil pan with a socket and a ratchet. The number of bolts will depend on the model. Set the oil pan aside.
Remove the bolts that hold the oil pump to the engine. Bolt the new oil pump onto the engine in place of the old pump using a new gasket. Tighten the bolts to the specification outlined in the manual for your specific VW. This will probably be around 15ft/lbs.
Place a new gasket and a bead of gasket sealant around the oil pan. Install the oil pan with the bolts that run around its perimeter. Fill the engine back up with the proper quantity of oil. Lower the vehicle to the ground.