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Launch X431 MCU3 Adapter for X-PROG3 GIII Work on Mercedes Benz All Keys Lost and ECU TCU Reading To program Mercedes all keys lost with X431 V, X431 V+, Pro5, Pros, Pro3S, X431 PAD V, PAD VII and X-PROG3 GIII, you will need to connect the MCU3 adapter to X-PROG3 correctly. Adapter board code: 307140131 Equipment configuration: non-standar..