Ford SID8 OBD-II Trouble Code Definition: SID8 03 – Pre/Post heating relay circuit. Relay not controlled and glow plugs supplied. SID8 Ford OBD-II Trouble CodeDescription: PSA OBD Trouble Code SID8 03 – Pre/Post heating relay circuit. Relay not controlled and glow plugs supplied. Sorry no other information,Please help us to improve,Any information is appreciated.Thanks. […]