On-Board Diagnostics (OBD) is a computer system inside a vehicle that tracks and regulates a cars performance. It collects information from the network of sensors inside the vehicle, which the system can then use to regulate car systems or alert the user to problems. A technician can then simply plug into the OBD system to collect vehicle data and diagnose the problem. OBD is commonly used across a wide range of vehicle types as an easy way to diagnose vehicle problems.

OBD-II is the second generation of on-board self-diagnostic equipment requirements for light- and medium-duty vehicles. It provides access to data from the engine control unit (ECU) and offers a valuable source of information when troubleshooting problems inside a vehicle. OBD-II is an improvement over OBD-I in both capability and standardization. The OBD-II standard specifies the type of diagnostic connector and its pinout, the electrical signaling protocols available, and the messaging format. It also provides a candidate list of vehicle parameters to monitor along with how to encode the data for each.

Some specific applications of OBD include driver behavior monitoring, commercial vehicle telematics, and measuring and managing vehicle health and driving. OBD is an important part of telematics and fleet management, making it possible to measure and manage vehicle health and driving.

In summary, OBD is a computer system inside a vehicle that tracks and regulates a cars performance. OBD-II is the second generation of on-board self-diagnostic equipment requirements for light- and medium-duty vehicles. It provides access to data from the engine control unit (ECU) and offers a valuable source of information when troubleshooting problems inside a vehicle. OBD is commonly used across a wide range of vehicle types as an easy way to diagnose vehicle problems.