I'm hoping someone can help, so that I can avoid potentially spending out unnecessary money here... although I'll say upfront that I don't know cars, so I would need a garage for anything past the very simple!
Car is Focus Zetec Tdci (110) 1.6L Diesel - 2005 (can't remember if it's 05 or 55)
This morning as I left for work, my Focus displayed 'Engine Systems Fault' with the red LED intermittently but fairly frequently during 5 minutes - I drove home and borrowed my partner's car for the commute. This evening I've had a bit of a look around and found the 'dashboard trick' which I've used to find within the test system the information "DTC #01 D900". Further searching online indicates this means "non specific can communications interruption" and does NOT indicate a fault on the car, but is merely reporting that the networking around the car had an unidentified interruption in power supply.
If this is the case, then does anyone know how I can get rid of it please? I'm looking to buy a new car and part ex soon, so even if this isn't a "real issue", I'd prefer it wasn't presenting itself.
Also the car (when idling as going through the test menu) felt "jittery" this evening, a bit like it did when I ran my diesel too low (which isn't currently the case!), so I'm concerned in case there's a real issue.
I drive to and from work 4-5 days a week, 30 minutes each way, mostly on the motorway. Last week we drove to holidays - 2.5 hours drive there, shorter journeys while away and then the journey back split into 1 hour and 1.5 hours. My partner was driving the car while away, but didn't find anything unusual with the drive, I drove it to the shops on the weekend and also didn't sense any issues.
Thanks for any help people could give... and apologies in advance if I have to ask some follow up questions to clarify my understanding a bit (just in determining how serious / expensive / how much help I need!)