Hi my 2001 Gt-tdi 115bhp has recently started giving me the following message" oil workshop manual" this flashes for around 5 seconds then it disappears.It didnt do it that often but its started doing on every start up now where before it was more random.Ive just recently had a oil change so levels are fine the car does not play up etc its running fine.I did manage to take it to my friend who works for a VW main dealer,so he plugged it in on the laptop to see if it bought up any faults which it didnt.Ive had a search on the net but not really to much info on it so im guessing the oil sensor is faulty maybe ?if so which one as ive been told theres 2 on my car?Anyone had simlar problem any info would be great thanks.