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Check the listing for details. J1939 Simulator OBD II Simulator OBD2 ECU Simulator w/ 2.4" TFT Screen ot25. Condition: New. Listed at 115.90 USD. J1939 Simulator OBD II Simulator OBD2 ECU Simulator w/ 2.4" TFT Screen only Supports J1939 Protocol. The vehicle OBD II simulator is a simulator device that simulates the vehicle OBD bus protocol. It is very convenient and practical.