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A 270 900 21 00 Mercedes CLA250 2017-2019 ecm ecu computer ENGINE CONTROL MODULE This is a good ecmStock # B31 This is a good ecm or engine computer for a 2017 2019 Mercedes CLA250. The part # is A 270 900 21 00. It comes with a 90 day warranty. Make sure your part number matches before ordering. Computer may need to be reprogrammed to your vehicle.