Foxwell NT204 OBD2 Check Engine Light Fault Code Reader Scanner Diagnostic ToolFOXWELL NT204Auto OBDII EOBD Scanner Tool The NT204 is a vehicle fault diagnostic tool specifically designed to determine the cause of a vehicle's Check Engine Light. It will enable you to read and clear the diagnostic fault codes and turn off that check engine light for good. Advanced options include live engine data stream as well as graph displays and emission status readiness. We have tested the scanner on many vehicles with excellent results.