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Catalytic Converters on Toyota Avensis?

I am not a mechanic.
I own a 2001 Toyota Avensis GLS VVT-1 1998 CC Saloon.
I have been told that the car has two catalytic converters.
Is this the case? If so, why are two required and how can you identify which one requires changing?
Eric Barty, July 2012
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