Ford P3420 OBD-II Trouble Code Definition: P3420 Cylinder 3 Deactivation/lntake Valve Control Circuit High P3420 Ford OBD-II Trouble CodeDescription: OBD Trouble Code P3420 Cylinder 3 Deactivation/lntake Valve Control Circuit High Sorry no other information,Please help us to improve,Any information is appreciated.Thanks. […]