Mercedes-Benz S 400 CDI Lang year 2002 Lang . Fault. The engine stops suddenl y when driving in the normal traffic. It won`t start if you don`t remove the ignition key and wait about 20 seconds. Then you can start, but the startmotor runs about 3 seconds, before the engine starts to run. And then you won`t get too far and the engine stops again . I had to start the engine 10 times to get back home and the distance was only 3 kilometres. During the stop the error messaseges are shown , but when the ebngine starts again it shows no malfunction . And then you can drive a hubdred meters and the engine dies again.