Well, a brief Google suggests it's the camshaft position sensor. I can't tell you anything about fixing it. I can suggest that you use this as a screening test for repair shops--if they can't tell you what it is, try another shop until someone figures it out. Certainly a VW dealer will know what it is (please tell us that it wasn't a dealer...).
Is the car acting funny? As in shutting off when it reaches operating temperature and not starting until it takes a few hours to cool off? Just wondering, because I just had to have that sensor replace about a month ago. It came on with now warning and the check engine light would only come on right when it shut off and stay on for a while after it started up again. I think it cost like $300 Canadian, for the part, labour and labour to put in a new rad fan, taxes incl.
I'm not sure if it might be an early warning that the sensor's going or not, but it starts to act like I mentioned above, it's probably that.
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