TURN OFF CHECK ENGINE LIGHT The MS309 OBD2 scanner is an easy-to-use plug-and-play check engine code reader that reads and clears diagnostic trouble codes. This compact code scanner retrieves generic codes (P0, P2, P3, and U0), manufacturer-specific codes (P1, P3, and U1), and pending codes, displaying DTC definitions on the TFT color screen. It helps identify the cause of the check engine light and allows users to turn off the MIL light. NOTE: This device does not support full engine system diagnostics. For advanced diagnostics, consider models ML629 or MK808BT.FREEZE FRAME DATA FOR ACCURATE DIAGNOSIS The MS309 check engine code reader includes a freeze frame function that allows retrieval of data recorded by the ECU at the moment a fault occurred. This helps determine the cause of the check engine light and reduces test drive cycle verification time. It displays key engine parameters such as RPM, vehicle speed, mass airflow, engine load, fuel pressure, short/long term fuel trim, engine coolant temperature, and more.READINESS STATUS TO PASS SMOG CHECK The MS309 car diagnostic scanner features an I/M Readiness function to check the status of emission system monitors on OBD2-compliant vehicles. It supports vehicle-specific monitors including misfire, fuel system, comprehensive components, O2 sensors, EVAP system, and others. This makes the tool ideal for preparing vehicles to pass emissions testing.UNMATCHED COMPATIBILITY The MaxiScan MS309 compact pocket code reader supports all OBD2 protocols: KWP2000, ISO2000, ISO9141, J1850 VPW, J1850 PWM, and CAN. It is compatible with all OBDII-compliant vehicles, including passenger cars and light trucks. Typically fits EU vehicles after 2006, Asian vehicles after 2009, and US vehicles after 1996. NOTE: This device does not support ABS, brake, SRS, or full engine systems. For these functions, consider models ML629 or MK808BT or higher.