Scan and clear engine fault codes and display their meanings. The database contains more than 3000 general code definitions to help identify the problem and guide the solution, saving you time and money. Clear the error codes and turn off the MIL (Check Engine indicator light). Display current engine data, including engine revolutions per minute (RPM). Compatibility: applicable to most cars based in the United States (1996 and newer), Europe and Asia (2000 and newer), and other newer OBD II and CAN vehicles, whether domestic or imported. Use scenarios Roadside diagnostic: when the Check Engine Light comes on, quickly scan to understand the likely issue and decide if the vehicle is safe to drive or requires immediate service. Home garage diagnosis: before scheduling a , review the fault codes and current engine data to plan effective maintenance or repairs. Vehicle evaluation: before a used car, check for existing or intermittent issues by scanning and reviewing live engine data.