Changing spark plugs is an important task. To do this, disconnect the battery and spark plug cables, and remove the old spark plugs. Next put in the new spark plugs, and reconnect the spark plug cables and then the battery.
The spark plugs on a 1998 Mercedes Benz E320 are changed by removing the cover plate, disconnecting the plug wires, and unscrewing the spark plugs using a deep wall socket. New plugs are then put in place and torque down to specifications.