2004 Benz C240 keys, EIS, and ECU inspection. The Benz had an intermitten crank no start. ECU Pro helped eliminate start control issues. Two ECUs were inspected and checked. One non functioning key was fixed. The EIS was inspected. The EIS crank position now returns without having to manually returning the switch. ECU Pro found the EIS to be in working order. All inspections were done for their diagnostic fee. Their service proved the crank no start issue is on the car and not control electrical parts. I would definately recommend their service. Great communication and turn around.