Problems with the Mercedes E-Class (W212) are often solved at the software level. As a rule, it is sufficient to update the PPC firmware: current versions of the software are available in the service centers of the authorized dealers. For example, if you have small knighters at a speed of 60-70 km per hour, it is necessary to apply to the dealer center, where they will make the reupholstery of the guarantee free of charge. It is necessary to be ready to leave the car for 1-2 days, as after the reupholstery it is necessary to adapt it and track the correctness of the work by the use of the scanner.