Dropping the oil pan requires the engine to be warm and the car jacked up, so the oil can be drained and the catalytic converter removed. Before starting the vehicle repair, have the vehicle parked on a stable, flat surface with the parking break engaged.
Start the car, and idle the engine for about 10 minutes. Turn off the engine, open the hood and remove the oil cap, which is usually located on the right side of the engine block. Jack up the car, and place the jack stands; make sure to follow all the jack manufacturer's instructions and safety procedures because crawling under the car is required.
Drain the oil from the engine into a drain pan by removing the oil drain plug located on the bottom and to the rear of the oil pan. Allow the oil to fully drain before removing the drain pan for inspection. If the oil isn't degraded, reuse it, otherwise dispose of it properly.
Disconnect the negative battery cable from the battery post. Crawl under the vehicle, and remove the catalytic converter using the appropriate size wrench. The catalytic converter is located under the engine and runs all the way to the back of the vehicle. Once it is out of the way, you can remove the 16 screws around the outside edge of the oil pan. With the screws removed, the oil pan falls freely from the vehicle.