I have just brought a citroen c4 that won't start the person I got it from just had the head gasket done and a new coil pack and plugs. It doesn't seem to spark but is cranking over I have put it on diagnostics and came up with a number of codes also the person I brought it from was driving it for 2 weeks before it broke down I have checked around the engine for a loose earth or something with no luck the faults I'm getting are fuel injection low voltage 1 to 4 coil faults 1 to 4 also half the dash doesn't light up most the time and windows don't work any ideas what this could be