On-Board Diagnostics (OBD) is a system that monitors a car’s computer system and reports diagnostic trouble codes. Devices like an OBD-II code reader can read diagnostic trouble codes (DTC) that the system stores when something goes wrong. Typically, at least one code is logged whenever the check engine light is illuminated.

OBD stands for On-Board Diagnostics and is a computer system inside of a vehicle that tracks and regulates a car’s performance. This on-board computer system 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.

On-board diagnostics (OBD) is a term referring to a vehicle's self-diagnostic and reporting capability. In the United States, this capability is a requirement to comply with federal emissions standards to detect failures that may increase the vehicle tailpipe emissions to more than 150% of the standard to which it was originally certified. [1][2]

Apr 25, 2023 · What is OBD? OBD stands for On-Board Diagnostic. It’s the standardized system that allows external electronics to interface with a car’s computer system.

Jul 15, 2018 · OBD is short for “On-Board Diagnostics”. It is a standardized system that allows a vehicle’s computer to interface with external electronic devices. The devices are popularly known as OBD scanners or OBD scan tools. By doing so, OBD gives the vehicle the ability to do self-diagnosis and reporting.

Oct 16, 2021 · The OBD, short for the On-Board Diagnostics system, was established to regulate vehicle emissions and facilitate the mass adoption of electronically controlled fuel injection systems. The simple idea behind OBD functions is the Electronic Control Unit (ECU) or PCM (Powertrain Control Module).

Feb 22, 2025 · On-board diagnostics (OBD) is an automotive term referring to a vehicle’s self-diagnostic and reporting capability. OBD systems give the vehicle owner or repair technician access to the status of the various vehicle sub-systems.

Oct 12, 2023 · OBD, or on board diagnostics, was introduced by General Motors in 1981 to monitor the emission control system in the car. In 1986 California mandated that all cars sold in the state be equipped with OBD, and it became the industry standard.

Nov 25, 2020 · On-board diagnostics (OBD) refers to the automotive electronic system that provides vehicle self-diagnosis and reporting capabilities for repair technicians. An OBD gives technicians access to subsystem information for the purpose of performance monitoring and analyzing repair needs.

Mar 10, 2025 · OBD-II is an essential system for vehicle diagnostics, emissions monitoring, and performance optimization. Understanding its communication protocols, services, and diagnostic trouble codes helps in efficient vehicle maintenance and troubleshooting.