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.

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

Tested: Best OBD-II Scanners for 2025 Did your vehicle's check-engine light just pop on? An OBD-II scanner can point you in the right direction—and potentially save you a bundle.