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Old 04-15-2015, 07:52 AM   #1
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Question P0430 CEL code question / Secondary CAT?

I have a laundry list of things that I need to do to the Boxster now that it is Spring. One of the things high on the list is tracking down CEL code P0430 (Catalytic Converter Conversion Too Low- Cylinders 4-6).

I have done a lot of reading on the issue, and plan on doing the usual things first. I will do a Durametric reading, swap the O2 sensors from side to side (cleaning the connections and holes), do a smoke test, and maybe a clean the MAF.

My question is, if it turns out to be the CAT, does the P0430 code indicate the secondary CAT? If so, rather than replace the CAT with a used one, wouldn't i be better off in the long run with just doing a Secondary CAT delete? I was thinking, based on the info here that I would go with the Cerket Werks setup.

I need opinions please.
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Old 04-15-2015, 08:41 AM   #2
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Originally Posted by Hogosha View Post
I have a laundry list of things that I need to do to the Boxster now that it is Spring. One of the things high on the list is tracking down CEL code P0430 (Catalytic Converter Conversion Too Low- Cylinders 4-6).

I have done a lot of reading on the issue, and plan on doing the usual things first. I will do a Durametric reading, swap the O2 sensors from side to side (cleaning the connections and holes), do a smoke test, and maybe a clean the MAF.

My question is, if it turns out to be the CAT, does the P0430 code indicate the secondary CAT? If so, rather than replace the CAT with a used one, wouldn't i be better off in the long run with just doing a Secondary CAT delete? I was thinking, based on the info here that I would go with the Cerket Werks setup.

I need opinions please.
P0430 is the three way cat on the 4-6 bank.
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Old 04-15-2015, 08:50 AM   #3
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P0430 is the three way cat on the 4-6 bank.
Thanks JFP! After a quick call to the Porsche Dealer, and giving him my VIN, it seems that mt 99' does not have the secondary CATs ( I have not been able to get under it yet) So, the CAT delete is a non-issue. Would the 4-6 bank be drivers side, or passenger side?
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Old 04-15-2015, 10:03 AM   #4
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Originally Posted by Hogosha View Post
Thanks JFP! After a quick call to the Porsche Dealer, and giving him my VIN, it seems that mt 99' does not have the secondary CATs ( I have not been able to get under it yet) So, the CAT delete is a non-issue. Would the 4-6 bank be drivers side, or passenger side?
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Old 04-16-2015, 05:50 AM   #5
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I also had a P0420, the Bank 1 cat code and it turned out to be the MAF.
(Accompanied by P01026, P01033)

I sprayed the MAF and the plug/harness contacts with MAF cleaner, then cleared the codes and the code has not come back in a week of daily driving.

I also pulled the air filter and found bits of paper in the filtered side of the airbox, that looked like a part sticker had come apart and somehow ended up on the filtered side down by the water drain hole.

Probably a contributing factor to fouling the MAF.
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