The car is playing up
N75 valve is coming up as a fault code, but the code CAN NOT be cleared suggesting possible wiring fault.
Failure of the late combined multi pack N75 valve seems to be very uncommon so possible fault in the wiring harness between the ECU and N75 valve
 
I had a problem with my coolant temp wiring but I couldn't find anything so I emailed haynes and they gave me a good reply telling me what the wires should read and where each wire goes so that might be worth a go if all else fails.:)