TURN OFF CHECK ENGINE LIGHT MS309 OBD2 scanner is an easy-to-use plug-and-play check engine code reader that read and clear codes. This little code scanner retrieves (P0, P2, P3, and U0), manufacturer specific (P1, P3, and U1) codes, and pending codes and displays DTC definitions on the TFT color screen. It can easily find out what caused the check engine light on, turn off MIL light.NOTE: It does not supports full engine system, if need, pls consider ML629/ MK808BT, etc.FREEZE FRAME DATA FOR ACCURATE DIAGNOSISThis MS309 check engine code reader comes with viewing freeze frame function that enables you to retrieve data recorded in the ECU of the condition under which the fault occurs to figure out why the check engine light is on and cut down test drive cycle verification time. It includes important engine parameters such as RPM, vehicle speed, mass airflow, engine load, fuel pressure, short/long term fuel trim, engine coolant temperature and etc.READINESS STATUS TO PASS SMOG CHECKThe MS309 car diagnostic scanner tool comes with I/M Readiness function to check the operations of the Emission System on OBD2 compliant vehicles. It includes vehicle-specific number of monitors like misfire monitor, fuel system monitor, comprehensive components monitor, O2 sensors, EVAP system and etc, making this OBD2 scan tool an excellent scan tool to help get your vehicle ready to pass the annual smog check.UNMATCHED COMPATIBILITY MaxiScan MS309 compact pocket code reader supports all OBD2 protocols: KWP2000, ISO2000, ISO9141, J1850 VPW, J1850 PWM and CAN. This OBD2 code scanner is compatible with all OBDII-Compliant vehicles, passenger cars or light trucks. For OBD2 cars, usually, EU cars after 2006, Asian cars after 2009, US cars after 1996. NOTE: It does NOT supports ABS, brake, SRS, full Engine systems, etc. If need pls consider ML629/ MK808BT or above.jj