Ford P1491 OBD-II Trouble Code Definition: P1491 Rad Fan Control Relay Circuit P1491 Ford OBD-II Trouble CodeDescription: Chrysler OBD Trouble Code P1491 Rad Fan Control Relay Circuit Sorry no other information,Please help us to improve,Any information is appreciated.Thanks. OBD Trouble Code P1491 Secondary Switch Solenoid Circuit Malfunction Sorry no other information,Please help us to improve,Any information […]