147 Catalytic Convertor Replacement? - Alfa Romeo Forum
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147 Catalytic Convertor Replacement?

Hi all,
I strongly suspect the cat on my 147 2.0 petrol is collapsing inside.
I get a really loud rattle for a couple of mins after startup and it seems a little down on power.

Which leads to my Questions:
Is there only one cat on the 147


Which cat should I get, dealer part, a cheaper make (so long as it's not a false economy) or some kind of compatible sports cat although my exhaust is standard.

Any help appreciated as always.

Don't eat to many choccy eggs Happy Easter all.
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On my old 1.6 147 (02 plate) the front part of the exhaust has a twin cat, and one of them had a rusted hole in it.

I decided to get rid in the end due to the section costing about 300 to buy on the cheap, then fitting, plus lambda sensors wouldn't have been worth my while.
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147 Ducati Corse


There's 2 cats on the downpipe & 2 lambda sensors (not good with spellings).

Just after the flex, towards the back is a larger cat, (lambda sensor bolted in the rear of this one) that can be dropped out & replaed easily. I just replaced this one, as it formed a solid lump & was blocking the exhaust. 150 approx down the pan now as under a month later the catalyst bit has jsut been smashed out of the new one as it's done the same

If anyone knows waht causes this I'd love to have an answer too btw - please?

Etna Black 147 Ducati Corse Q2
Previous Alfas: 147 1.6TS Lusso (Grigio-Verde)
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