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For all you high mileage boxster owners out there (80k or up), start saving some cash for a set of O2 sensors and replace all four. Replacing one or two when they go bad will only yeild poor performance and more CE lights. So it's all four or nothing really.
MAF's seem to last longer for some owners, and I am going to wait unti mine dies or 100k, whichever comes first. If I hit 100k, I'll replace it regardless because I just don't like CE lights. Should I find one on Ebay cheap, I might just do it before then.
From what my mechanic tells me, replacing the MAF and all four oxygen sensors at the same time on a high mileage boxster is a good preventative maintenance item. It ain't cheap, but it insures that the car will run well, have no CE lights and the owner will not get freaked out when one (or four) is required at a whopping price a week before Christmas or any other time of year when you don't have the money to spend on it!
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