Common problems found in a used Mercedes-Benz S430 include airmatic pump motors failing and the failure of the CD changer and voice control units. Some owners also report the failure of the crankshaft position sensor.
One of the most common issues with a used Mercedes-Benz S430 is the failure of the airmatic pump motor, which may continue to run after the owner turns the car off. There are also reported issues with electronics in the car, including the voice control units, CD changers, command units and TeleAid units. Engine performance may also become an issue due to the failure of the crankshaft position sensor.