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My 1998 V70R has 185K miles and I suspect that the front O2 sensor is starting to fail, the mpg is not what I would like it to be. Unless abused and very dirty, the O2 sensors do last a long time.
Because yours is a turbo, check all of the inter-cooler connections as well as the throttle body connection. After I had replaced all of my PVC stuff, the throttle body connection was not tight: It idled fine, but as soon as I gave it boost, the connection came loose and I barely made it back home. I couldn't tell at first glance that it was loose, it wasn't until I started twisting the connections that I realized what the problem was.
Keep looking,
Klaus
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Two great Volvos, a 1967 220 and a 1998 V70R
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