How do you replace the oil pump on a Toyota Previa?

To replace the oil pump on a Toyota Previa, first, ensure the engine is cool and disconnect the battery. Remove the oil pan by draining the oil and unbolting the pan, then detach the oil pump from the engine block. Install the new oil pump, ensuring the gasket is properly seated, and reassemble the oil pan. Finally, refill the oil and reconnect the battery before starting the engine to check for leaks.