OBD II is an On-Board Diagnostics standard that is used on a large variety of cars. It provides access to numerous data from the engine control unit (ECU) and offers a valuable source of information when troubleshooting problems inside a vehicle. This is an OBD-II to DB9 cable, which allows you to access your car’s OBDII connector. It provides a OBD II and DB9 female connectors. It is indispensable tool if you want to hack your car.