Hello With a SL55AMG lights up in the AI ABC is disturbed, error memory is short test and there is pressure sensor disturbed in it. Ok then the tests performed and it was called I should renew the hydraulic pump that sits in the front of the engine. I changed everything and filled in oil and ventilated, took a short test and then engine started again the same error message again tested says again pump defective. The pump builds up pressure of approx. 200Bar in approx. 80seconds, I find it too much. I then sometimes pressure sensor or ventli block that sits in the wheel box at the front left and still needs the same problem or error in the memory inside. both things new is not normal after all. And again when I do the test he brings the pump that I have exchanged now already three times or the pressure increase during the test always needs 80sec. with a comparison car it takes only approx. 10seconds. MFG.