After replacing gearbox valve body or gearbox ECU, it is required to perform programming and coding. If still unable to engage the gear or the gear is locked at 3rd gear position, Gearbox Self-learning shall be performed.When strong shock is felt during gearshift, perform this function.So here car-auto-repair.com show you guide on how to use Launch X431 Pro to perform gearbox programming & coding for Mercedes Benz W211. What You Need? Launch X431 V Pro NOTES: 1.Apply the parking brake. 2.During Gearbox Self-learning, perform the gearshift correctly as prompted. 3.Gearbox Self-learning failure will cause vehicle start failure. Turn on the ignition again and repeat the gearbox self-learning function. Operation Procedure: 1.Select the Mercedes-Benz Version above V48.00. 2.Select manual selection. 3.Select 211. 4.Select Automatic Transmission System. 5.Select Special Function. 6.Select “Learning process: Y3/8s1 (Selection range sensor (VGS))”: 7.When prompted to