A scan tool is an advanced diagnostic device that communicates with a vehicle’s onboard computer to retrieve error codes, monitor live sensor data, and perform system tests. More capable than basic OBD2 readers, scan tools can reset maintenance lights, activate components, and analyze complex systems like ABS, airbags, and transmission controls. Used by professionals and serious DIYers, they provide deep insights into vehicle health. Many modern scan tools connect via Bluetooth to smartphones or tablets for easy data review. Regular use helps catch problems early, reducing repair costs and improving reliability. Choosing a compatible, up-to-date scan tool ensures accurate diagnostics and confident decision-making for every vehicle.