OBD2 Diagnostic Scanner
Updated June 17, 2026
An OBD2 diagnostic scanner is an electronic tool that plugs into a vehicle's OBD2 port (typically under the dashboard) to communicate with the vehicle's onboard computer systems. It retrieves diagnostic trouble codes (DTCs), displays live data streams, and can perform advanced functions such as bidirectional control, special resets, and key programming on compatible models. These scanners are used by both professional mechanics and DIY enthusiasts to identify and troubleshoot vehicle issues.
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How It Works
The scanner connects via Bluetooth or a cable to the OBD2 port. It uses the vehicle's diagnostic protocols (e.g., CAN, CAN FD, DoIP) to communicate with ECUs. The user interacts through a dedicated app or built-in screen to read codes, view live data, and perform tests. Some models require a smartphone app download.
Common Features and Functions
Typical functions include reading and clearing diagnostic trouble codes, viewing live data streams, performing active tests (e.g., actuating components), and running special service resets (e.g., oil reset, brake bleed, TPMS). Advanced models offer bidirectional control, ECU coding, and immobilizer/key programming.
Installation and Usage Notes
No permanent installation is required. Simply locate the OBD2 port (usually under the driver's side dashboard), plug in the scanner, and turn the ignition to the 'on' position. Follow the device or app instructions to establish communication. Ensure the vehicle is compatible with the scanner's supported protocols.
