Feature: 1. READ CODE AND CLEAR CODE: Knowing the code ahead of time will prepare you for a cost estimate of the repair at the repair shop, so you can obviously save hundreds of dollars in diagnostics, why not? You can use the MS309 to retrieve generic codes, manufacturer specific codes and pending codes in seconds with DTC definitions displayed under codes, quickly locate problem areas and then clear/reset codes after proper repair.2. Turn off check engine light: When your car detects an emiion related problem, the check engine light will be turned on. Does it cost hundreds of bucks to turn off the light every time, maybe it's just a fuel cap that's not screwed on or bad parts like spark plugs, ignition coils, etc. need to be replaced? Using the Autel MS309 scan tool, you can read the code to quickly find out why the check engine light is on and reset it.3. Ready for Annual Smoke Check: If the OBD II readine monitor on your car is not ready, your car may fail the smoke check. The MS309 OBD2 scanner can retrieve I/M Readine status to check for misfire monitors, fuel system monitors, integrated component monitors, catalyst monitors, O2 sensors, EVAP and more to help prepare your car to pa the annual smoke inspection. That way, you don't waste time and money on failed smoke checks.4. Screen DTC definition, easy to use: Isn't this exactly what you want? Each code has its definition behind it, saving time and effort, quickly locating the problem location, very suitable for car DIY enthusiasts and beginners. When reading the code, the corresponding DTC definitions are located below the code. The MS309 OBDII scan tool communicates with the vehicle via a standard 16-pin OBD2 cable and is powered directly by the vehicle - no batteries required.5. Retrieve