What is OBD2 Scanner?
TL;DR
A device that plugs into a car OBD2 port to read engine data and diagnostic trouble codes.
OBD2 Scanner: Definition & Explanation
An OBD2 scanner is a tool that connects to the standardized On-Board Diagnostics II port found on most cars made since the mid-1990s. It communicates with the vehicle computer to read live sensor data, freeze-frame snapshots, and diagnostic trouble codes, and it can often clear codes and turn off a check-engine light. Many consumer scanners use the ELM327 chipset and stream data over Bluetooth to a phone app, replacing bulky handheld units. Popular options include FIXD, BlueDriver, and Car Scanner. Basic models read generic codes only, while enhanced units add manufacturer-specific ABS, airbag, and transmission diagnostics. Limitations include variable support for older or non-standard vehicles, dependence on app quality for interpretation, and the fact that a raw code still needs analysis to point to the real fault.