Had P1171 show up on my S70. Local dealer kept throwing parts and labor at it: "let's just reset it and see if it goes away," "oh... we found a loose vacuum hose and fixed it," "replaced the oxygen sensor... all fixed." After the fourth time that P1171 came up, I subscribed to All-data and found that replacing the mass air flow sensor was the top cause of this problem. When I went to the dealer and told them what to fix, the shop foreman was surprised that this wasn't done first. (Yeah, right! They get paid for warranty work regardless of whether or not they actually fixed the problem.) In any case, once the MAF sensor was replaced, the car hasn't had a problem since.
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James Rothe, '99 S70 T5M, http://www.monmouth.com/~rothe/carstuff.html#Volvo
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