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Discussion Starter #1

I have p307 2.0l petrol 136hp, made in 2002 years.
i got one problem.
"permanent fault. Catalytic converter ageing. loss of efficeincy of catalytic converter"
Could this problem be caused by this thing?
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if anyone knows what is this thing please tell me, and what he is doing in car?
(it's looks like a catalytic conventer).
second question there is a black plastic cap on the top of hose. is it should be closed?
sorry for bad english... and sorry if was talked about the same problem before..
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