Underboost intermittent

rowdyboy

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Hi guys, I'm posting on behalf of a mate. He's got a 170 Tdi and says he's getting a "underboost intermittent" fault. I've not asked where he's got the message from or how it's been scanned. Does anyone have any ideas what a cause could be or have you come across it before?
Cheers.
 
could realy do with the code he got