Using an OBD2 (On-Board Diagnostics II) scanner is a relatively simple process that can provide crucial information about the vehicle’s electronic and mechanical components alike.

Did your vehicle's check-engine light just pop on? An OBD-II scanner can provide some direction. We tested a handful to find the best for different situations.

Discover what an OBD2 scanner is and how to use it to diagnose and fix car problems before they escalate into major repairs.