Using Hand Held Tester (HHT)
WARNING: This page does not describe the selected car, but rather 16 other vehicles, including the 2002 Mercedes-Benz SL500, 2002 Mercedes-Benz S500, 2002 Mercedes-Benz S430, 2002 Mercedes-Benz E55, and 2002 Mercedes-Benz E430. However, it is still accessible from the selected car via links, so may be relevant.
Turn ignition off. Connect HHT to 38-pin diagnostic connector located in right rear of engine compartment. Turn ignition on. Follow manufacturer's instructions for reading fault codes. If no fault codes are present, but vehicle is experiencing a problem, go to TROUBLE SHOOTING - NO CODES (ENGINE 113 - EXCEPT G500) article.