The Fabspeed OPF Monitor interfaces seamlessly with your vehicle OBD2 system. The OPF monitor automatically identify and detect specific error codes, giving you the confidence that all are being compensated for. The Dyno proven OPF system eliminates annoying useless CEL codes while not even touching or going into the cars ECU. No ECU reprogramming is needed to eliminate OPF fault codes. Perfect for Worldwide cars that have removed and eliminated OPF/DPF systems .