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P0420 code - SOS downpipes & Fabspeed Cat Back exhaust

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Just a few minutes after starting the car and hitting the highway, I got simultaneous warnings on the dash. Emissions System Problem and Electronic Parking Brake Problem.

Dealer said it had a P0420 code for the catalytic converter. The car is under warranty, but due to the aftermarket items, they cleared the codes as a courtesy and said I'm on my own. I was hoping they would do more or replace something since Google shows lots of Acura and Honda owners hitting these same two warnings at the same time.

I've had the car for 2 months / 400 miles, and this is the first time it complained. The previous owner had the parts installed at their local Acura dealer, so I suspect it was all done properly. I like the sound and would rather keep things as-is if it's just a warning. No emissions requirements where I live.

Should I just invest in an OBD2 tool and clear this code anytime it shows? Any other recommendations? Thanks!
 
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Just a few minutes after starting the car and hitting the highway, I got simultaneous warnings on the dash. Emissions System Problem and Electronic Parking Brake Problem.

Dealer said it had a P0420 code for the catalytic converter. The car is under warranty, but due to the aftermarket items, they cleared the codes as a courtesy and said I'm on my own. I was hoping they would do more or replace something since Google shows lots of Acura and Honda owners hitting these same two warnings at the same time.

I've had the car for 2 months / 400 miles, and this is the first time it complained. The previous owner had the parts installed at their local Acura dealer, so I suspect it was all done properly. I like the sound and would rather keep things as-is if it's just a warning. No emissions requirements where I live.

Should I just invest in an OBD2 tool and clear this code anytime it shows? Any other recommendations? Thanks!
I purchased a 2018 in October. With SOS downpipes with the same issue. I contacted SOS about it but the warranty is for the original purchasing party. But it’s also been on the car over a year. However SOS did offer to recat both units for a REALLY reasonable price. Note: It’s a 12 week lead time. I’ve been a Technician for Honda over 20 years. We do have emissions extensions on certain cars for catalytic converters, fuel injectors and so forth. But once you have aftermarket parts it becomes the owners responsibility. Sadly we don’t have any current Service news/bulletin’s that apply for the NSX to Update the PCM to change the parameters for giving false converter codes like a few other 4 cyl and V6 models have.

Does your car happen to have a SOS JB4 tuner on it? You can check and clear codes with the JB4 and also change your tune for a few more ponies.

On a side note. Did you purchase this car from Karen Radley Acura? I was interested in an orange NSX they had back September.
 
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If you go to the web site for Fabspeed and look up the NSX you will see their offerings. Note that they offer the following: Acura NSX Exhaust Valve Simulators (FS.ACURA.NSX.EVS) - $300
perhaps your car does not have these? They recommend for 2019 and up. Often the codes that are thrown are not always so definitive. I have the SOS downpipes with stock exhaust and have never had a error code thrown in the last 11,000 miles and 3 years of ownership.
 
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md23vtec, yep, this is the orange 2019 from Karen Radley :) It doesn't have the SOS JB4 as far as I'm aware, but a friend recommended the Autel Autolink AL319. I got it for $32 and successfully cleared the codes. In addition to P0420, it showed P0430 as well. Both related to cats.

drmanny3, I assumed the previous owner got the exhaust valve simulators, but I might as well double check.

Noob question...are there cats on both the SOS downpipes and Fabspeed exhaust, or just the downpipes? That will help me isolate which company to try asking for a favor.

Thanks!
 
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md23vtec, yep, this is the orange 2019 from Karen Radley :) It doesn't have the SOS JB4 as far as I'm aware, but a friend recommended the Autel Autolink AL319. I got it for $32 and successfully cleared the codes. In addition to P0420, it showed P0430 as well. Both related to cats.

drmanny3, I assumed the previous owner got the exhaust valve simulators, but I might as well double check.

Noob question...are there cats on both the SOS downpipes and Fabspeed exhaust, or just the downpipes? That will help me isolate which company to try asking for a favor.

Thanks!
I believe it is just the downpipes but don't quote me. :)
 
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md23vtec, yep, this is the orange 2019 from Karen Radley :) It doesn't have the SOS JB4 as far as I'm aware, but a friend recommended the Autel Autolink AL319. I got it for $32 and successfully cleared the codes. In addition to P0420, it showed P0430 as well. Both related to cats.

drmanny3, I assumed the previous owner got the exhaust valve simulators, but I might as well double check.

Noob question...are there cats on both the SOS downpipes and Fabspeed exhaust, or just the downpipes? That will help me isolate which company to try asking for a favor.

Thanks!
P0420 is Bank 1 P0430 is Bank 2. Both converters have codes so you need both down pipes. The lead time was 8-12 weeks when I last spoke with them. With it being December and I assume you’re on the east coast it would be an ideal time to take them off and send them back if you want to get them recatted. You can email them directly.

[email protected]
 
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I have grp graham rahal exhaust and downpipes on my car and got same codes, my dealer reset for me and then I purchased the fab speed o2 sensor extenders which have a mini cat in them and had my dealer install for me, some have said it is waste of time to add extenders but wasn't expensive and worth a shot for me.. also bc it is not valved exhaust any more I also added the valve plugs to plug into hem harness to tell the car they are attached, I down drive often or really spirited but no codes thus far and probably jinxed myself lol.. hope you find a solution that works for you.
 
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SOS said the cats can get clogged from octane boosters or leaded fuel and it could affect efficiency/performance. It's possible octane boosters were used by the previous owner, but they offered to replace the cats for a reasonable price. Only thing is it's contingent on inspection.

So I'd have to find a shop to remove the downpipes, keep the car stored while I ship them to SOS, then get a replacement reinstalled.

Since the codes haven't come back since the last clearing, maybe the clogging is mild and I can procrastinate a bit more!

Interesting info about the Fabspeed O2 Sensor Spacer! That's a pretty clever workaround.
 
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Way back when I had my 2001 supercharged NSX I tried running straight exhaust by removing the cat. After a while I had codes appear. The straight cat replacement tube had threaded holes in the front and rear. I added an extension which is placed into the rear sensor opening. It sticks out perpendicular and fools the system in thinking there is a difference between the front sensor and the rear one. It worked. I understand there are some cleaners out there, but not sure they work.
 
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