Ford P1664 OBD-II Trouble Code Definition: P1664 1-4 Upshift Lamp Control Circuit P1664 Ford OBD-II Trouble CodeDescription: OBD Trouble Code P1664 1-4 Upshift Lamp Control Circuit Sorry no other information,Please help us to improve,Any information is appreciated.Thanks. VAG OBD Trouble Code P1664 Injector, activation – current circuit Sorry no other information,Please help us to improve,Any information […]