How do you replace the bulb in the fog lights of a 1999 Mercedes E420?

To replace the fog light bulb in a 1999 Mercedes E420, start by accessing the fog light assembly from beneath the vehicle. Remove the screws or clips holding the fog light in place and gently pull it out. Disconnect the wiring harness and twist the old bulb out of the socket. Insert the new bulb, reconnect the wiring, and secure the fog light assembly back in place.