That's catalyst below efficiency. It is not at all uncommon on older cars. Typical causes can be faulty front or rear oxygen sensors. Tiny pinhole leaks can also cause this code. Or the catalysts themselves may be spoiled. Hope it is not the catalysts because those are expensive to replace.
This is catalytic converter failure. You may want to check out this hub about it for details.
http://hubpages.com/hub/Catalytic-Conve … or-Dummies
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