Turn off the Check Engine Light: The O2 Sensor enables you to clear the engine warning light, after completing the full obd2 diagnostics with ease Pass Emission Test Smoothly: With this scan tool, you don’t have to drive around endlessly, continuously coming back to the repair shop for the retest. You can do a quick check of the vehicle, to determine if it is ready to pass the emission test On-Board Monitor: View the results of On-Board Monitor tests. The tests are useful after servicing or after erasing a vehicle’s control module memory I/M Readiness: Check the readiness of the monitoring system. It is an excellent function to use prior to having a vehicle inspected for compliance to a state emissions program Featuring 10 modes of OBD2 tests, can be compatible with most OBDII protocol compliant cars to read and clear emission codes, show live data, O2 sensor test, On-Board monitor test, component test and view vehicle information etc.