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Old 10-05-2016, 05:04 PM   #1
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Precat or Post cat P0420 and P0430?

Hi,
I have done a lot of research on this but still can't work out with codes P0420 and P0430, how to tell if it is the Precat (Three Way Cat) or Post Catalytic converter failing?

Can anyone give me some clues?
Thanks

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Old 10-05-2016, 05:17 PM   #2
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Both are for the three way cat.
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Old 10-05-2016, 05:20 PM   #3
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Thanks JFP.
Is it a different code for the Post-catalytic converter on a 986S?
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Old 10-05-2016, 05:24 PM   #4
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I've been looking at the Magnaflow CARB cats, I don't see how their 444204 would be able to replace the TWC.
https://www.magnaflow.com/products?partNumber=444204
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Old 10-05-2016, 06:19 PM   #5
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Sorry, I see there are no oxygen sensors for the post cats.
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Old 10-05-2016, 07:06 PM   #6
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Garage
Your best bet ( although technically not legal) is to buy a used one
Check ebay and wrecking yards

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