P0421 / P0431 Trouble Codes (Catalytic Converter) ... anyone have good fix?

While not directly related to this thread, i will put my 5p worth in.
I swapped out the OEM manifolds on my 430 for the Capristo pipes- now that i dont have the pre cats i was getting the usual codes, on advise from a ferrari service engineer i now allow the engine to tick over for a good 5 mi utes while the exhaust warms up-thinking here is that if you blip the engine you dump unburnt fuel through the exhaust onto the sensors and up comes the codes.
You need to bear in mind the loss of the pre cats allows the droplets of fuel to get onto the sensors as they are still relativly cool, where as when you had the pre cats it deposited on them and evaportated in the exhaust stream and not onto the sensors, a code is a very rare event these days for me

 

Steve you must install high flow cats now, the sound is amazing and trust me once you resolve the codes issue for deleting the pre cats inside the headers you won’t have any more codes
(High flow cats have actually more cat material before the 02 sensors than stock cats because in a stock configuration the 02 sensor is installed before the bigger one)


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Honestly I would look for a used set, I got a set here in Fchat that according to some members they were hyperflows. I don’t doubt Fabspeed or similar are very good but they are very expensive. There was this very affordable set on eBay maybe they were this “evoflow” but IIRC they were less than 1,000, so maybe for that price I will get the AP
View attachment 2511659


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I found them the manufacturer is top speed pro-1
The ad is expired but maybe you can send them a message through their other listings


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just as a FYI regarding those Top Speed high flow cats; the picture in the ad is wrong, there are no upstream O2 sensor bungs, just the one after the main cat. Similarly to what's been said, it's possible that this setup with the high flow cats won't trigger the CEL as the downstream O2 sensor on the stock cat is right in the middle of the cat and not after it like what you'd expect, so quite a bit of the exhaust gas scrubbing will still be happening after the downstream O2 sensor on the stock cat.

I haven't installed mine yet but here's what the pipes look like after getting coated at Swaintech for a 360:

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I have the Topspeed high flows and the sound with Fabspeed headers and Tubi exhaust is intoxicating. Mine for some reason shipped with a V-band clamp end on the exhaust side but fit perfectly after cutting it off with a band saw. No codes thrown, same O2 extenders and mini cats as you.

 

Thanks for sharing that, honestly I don’t see the point of upstream bungs, why would you use them? Even if you have stock headers I will ALWAYS install the 02 sensors on the downstream bungs.
I asked Fabspeed and they said they have upstream bungs to fit any kind of setup worldwide. Still I don’t see the point.


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What is the description of these codes ?

 

After a couple of weeks of daily drives, my CEL came back - stock headers, stock cats, CS valved exhaust - so I'm going to go with aftermarket headers. I just can't have the pre-cat disaster waiting to happen anymore. I want a set with O2 extenders and the option for mini cats, but this thread has so many options it's tough to choose!

 

So with all the stock cats in place your getting an 02 code?

 

Yep. Not only that, but we tried two different sets of stock cats. Both lasted about a week or two before the CEL reappeared.

 

If you have stock headers and stock cats (and two of them) your problem is something else. Have you tried swapping 02 sensors? What codes are you getting? 421 and 431? 421 is RIght side and 432 is left side. Swap the sensors from bank 1to bank 2 and see if the codes change to the other side.


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What I don't get is that there was no CEL when the pre-cats went south. Now with all good components I have a CEL. It makes exactly zero sense.

I may replace the O2 sensors.

I don't know what the specific codes numbers are, just that they are cat related. One about being out of range and the other not up to temp.

 

Try to do an overnight reset (kill switch) before you start replacing parts. That resolved my issue.


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Good point. I have not tried that. Do you just disconnect the battery for 12 hours?

 

Great. Do I have to get the codes cleared first, or will this do that?

 

Disconnecting the battery will clear everything, why 12 hours vs 5 minutes?
Honestly I have no idea, I tried several short resets and the CEL kept coming back. 12 hours did the trick
Of course you need to follow the recommendation to get the readiness monitors completed, it is a very easy process you just need to have an open road and 30 mins because you need to drive to a specific RPMS for X time and then come to a complete stop, let it idle etc
Aldous Voice instructions are actually better than the Ferrari bulletin because IIRC the Ferrari bulletin had a slight error.
https://aldousvoice.com/2013/01/16/ferrari-360-ecu-reset/

You would need some scanner tool to see if the readiness monitors are completed (I use my iPhone with EOBD facile app and ELM327 WiFi adapter
https://www.amazon.com/Foseal-Scanner-Adapter-Diagnostic-Android/dp/B00W0SDLRY/ref=sr_1_4?ie=UTF8&qid=1520435309&sr=8-4&keywords=elm327+wifi

If you have completed all the readiness monitors and your CEL is not back then you are good, the overnight reset (12hrs or so worked)

 

I would try changing the o2 sensors and be sure you don't have a header leak. If anti seize got on the tips of the o2's that could be a cause also.

 

Headers were replaced in December and they aren't leaking.

Okay - got the manual out! - I turn the Battery Master Switch to OFF and leave it overnight. Got it.

Will do after my afternoon drive.