Every car built since the late 1990s has an OBD-II port, usually under the dashboard on the driver’s side. Plug in the right device and the car tells you what is going on.

Read and clear fault codes

When the check-engine light comes on, an OBD scanner shows the exact fault code so you know whether it is a loose fuel cap or something serious.

Live data

See engine temperature, RPM, battery voltage and sensor readings in real time. This is useful for spotting problems before they get expensive.

Key programming

Professional OBD tools can program replacement keys and remotes on supported vehicles. Use them only on cars you own or are authorized to work on.

Which one to pick

For everyday drivers, a simple scanner is enough. For workshops and locksmiths, a professional tool with key programming pays for itself. See our OBD devices.