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Modern vehicles contain a multitude of networked electronics. This feature causes distributed functions in distributed electronics. Malfunctions occurring during EMC testing cannot be allocated precisely without detailed knowledge of the data streams. The electromagnetic environment during EMC-testing limits the possibilities of using standard solutions to detect these malfunctions. The paper will present a new tool, which is able to track the data streams in a CAN-Bus system during EMC-testing. By integrating EMC related parameters in the existing data stream of the vehicle's data bus, it is possible to keep a record of malfunctions as they occur.