Autel MS300 【TURN OFF CHECK ENGINE LIGHT】: MS300 check engine code reader can read, clear generic, manufacturer-specific and pending codes. 【MECHANIC APPROVED】: MS300 OBD2 scanner works with most OBDII compliant(OBD2 protocols: KWP2000, ISO2000, ISO9141, J1850 VPW, J1850 PWM, and CAN) sedans, SUVs and light trucks post-1996 for US cars, post-2000 for EU-based and Asian cars. 【DIAGNOSE IN SECONDS】: MS300 auto code reader features easy to use 2 button design to read, clear DTCs to help home mechanics locate car problems fast. 【SMOG CHECK】: MS300 car code reader retrieves I/M Readiness status to check emission-related systems like misfire monitor, fuel system monitor, comprehensive components monitor, O2 sensors, EVAP to help your vehicle ready pass the annual smog check. 【NO BATTERY NEEDED】.