How do you change lifters on a 2001 Ford Focus?

To change the lifters on a 2001 Ford Focus, start by disconnecting the battery and removing the intake manifold for access. Drain the engine oil, then remove the valve cover and rocker arms to expose the lifters. Carefully extract the old lifters using a magnet or a lifter removal tool, and install the new lifters in the same order. Reassemble the components in reverse order, ensuring proper torque specifications are followed, and refill the engine with oil before reconnecting the battery.