Do a search on "smog pump" and "air pump" -- there are a number of threads. Rebuilt pumps are available for around $300 (you send the old one in for a credit) and are easy to install; you might as well renew the valves at the same time -- they're probably bad and played a part in the pump's failure.
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'98 C43 AMG
'88 420SEL
'93 190E Limited Edition (including factory Sportline package)
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