Join Date: Aug 2006
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All I know is that Renault didn't diagnose it with all their diagnostic gear, but the Guy at the local garage did by putting his hand over the exhaust when I revved it !
Its just an idea, might not be your problem, but does sound like the same syptoms, I'm not sure how you check the cat other than taking the pipe off and having a look down the end. You couldn't blow down mine it was that blocked, but maybe that was an extreme case.
Currently in XTRO's garage:
Laguna 2.0 ide & Megane 2.0 16v Coupe