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One of the possible codes that could indicate the need to replace the MAF sensor also has vacuum/boost leaks as possible causes. It could very well be that you just have a loose vacuum hose that the dealer didn't spot, but has instead chosen to throw parts at it. (They make more money by billing Volvo for replacing the part than they would for reconnecting a vacuum hose.)
I recently had the opposite problem: dealer claimed it was a popped hose, etc, when ultimately the problem was solved by replacing the MAF sensor. More details at:
http://www.brickboard.com/AWD/index.htm?id=493180
James Rothe
'99 S70 T5M
http://www.monmouth.com/~rothe/carstuff.html
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