I have a check engine light on. I have had it re-set, but it lights up almost immediately, so I think it's time to take care of the problem. The code indicates that I need a new AIR pump. I believe it is located somewhere under the battery. I am wondering a couple things:
--It looks to be a relatively easy do-it-yourself job; is it?
--What IS an AIR pump? The car seems to run well with an apparently defective one. Will a new one help performance or efficiency? Can I expect better mileage?
--It is a relatively expensive part (I am getting prices at around $300.00). Is this a part that often fails (i.e., should I buy a new one, or should I find a used one at a salvage yard)?

Thanks
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Kevin ('98 v70 awd 83k; '92 745 turbo 135k)

Here's a guide to replacement with pictures with a much cheaper VW pump that works just as well and is a fraction of the cost: http://www.matthewsvolvosite.com/air_pump_replacement_850.php
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1998 S70 T5 Emarald Green Metallic, 2004 V70 2.5T Ruby Red, Previous Owner of Black '94 850 Turbo Wagon. My cars have been running so well lately they've got me worried.

I just went through (temporarily) fixing mine, see my post for details.
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1998 V70 T5 110Kmi; Previous car: 1985 SAAB 900T, 254kmi

it may drain the water out. But your Air Pump is probably gone by now.
Very easy, it sits directly below the battery.

Search old threads and you will see.

cn

You're on the right path. It runs fine because it's merely an emissions thing the pump pumps fresh air into the exhaust. I've flirted with going with a used one from these guys http://www.erievovo.com/. For repair, go here http://www.volvospeed.com/bay13.htm
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'98 XC '95 855 GLT '83 245 DL (245 for sale! e-mail me if your looking to buy); All over 125k miles