The Foxwell NT301 obd2 code scanner can read and erase codes which can also retrieve a wealth of information from the Engine Control Unit (ECU). The ECU is what triggers the Check Engine Light when there is a problem with your car. Parts that might cause your check engine light on include:

#1. Gas Cap #2. Oxygen Sensor #3. Air Fuel Ratio Sensor #4. Mass Air Flow Sensor #5. Ignition Coils #6. Spark Plug Wires #7. Spark Plugs #8. Thermostat #9. EGR Valve #10. Evaporatative Emission Canister Purge Valve(EVAP) #11. Catalytic Converter.