Ford P1666 OBD-II Trouble Code Definition: P1666 Driver 3 Line 6 P1666 Ford OBD-II Trouble CodeDescription: OBD Trouble Code P1666 Driver 3 Line 6 Sorry no other information,Please help us to improve,Any information is appreciated.Thanks. VAG OBD Trouble Code P1666 Injector 1 – current circuit Sorry no other information,Please help us to improve,Any information is appreciated.Thanks. […]