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A Mercedes Benz S350 car with a mileage of about 140 thousand km and a 272946 engine. Users reflect: after the car changes the ESP control module and the hydraulic pump control module, the one key without key start function is missing, the driving test can not be done, ABS, - ESP fault lights. Before this car, ABS, ESP fault light alarm, and with the heavy steering, the final maintenance plan is to replace the ESP control module and the hydraulic pump control module, the customer also agreed to replace, so to order parts, wait for accessories to arrive after the arrival of the WIS standard step history, more after the key to start the car without key function to start the car It will start the vehicle, but unplug the key without a key and insert the key to start the vehicle. First, the ABS fault is solved, so the online ESP control module is programmed. The last step after the programming needs the road test to do the driving test. The precondition of doing the test is: (1) pull the diagnostic plug on the vehicle.