Ford P1409 OBD-II Trouble Code Definition: P1409 EGR Vacuum Regulator circuit malfunction P1409 Ford OBD-II Trouble CodeDescription: OBD Trouble Code P1409 EGR Vacuum Regulator circuit malfunction Sorry no other information,Please help us to improve,Any information is appreciated.Thanks. OBD Trouble Code P1409 EGR Vacuum System Leak Sorry no other information,Please help us to improve,Any information is appreciated.Thanks. […]