CEL P0420 Test Pipe / HFC - Non-foulers

omg35s

My shop installed GTM RTP's on my 2007 g35s and unfortunately even with the extended o2 J-Bung my car is throwing CEL P0420.

I wonder why it's throwing only P0420, which is the passengers side and not P0430 which is the drivers side?

Berk and GTM were kind enough to explain that both these codes do not affect performance.

Berk has recommended to use stainless steel wool and maybe purchase non-foulers. Where is everyone buying these parts from? Links are appreciated.

Anyone else running this code with their RTP/HFC? What was your solution/experience?

I was also worried that maybe my o2 sensors were bad so I pulled some live data from my OBII scanner:

O2S B1 S1 (V) 0.445
O2S B1 S2 (V) 0.280

O2S B2 S1 (V) 0.900
O2S B2 S2 (V) 0.290

Does this look right?

Thanks!

djpathfinder

You can buy some steel wool at a hardware store, or even at a grocery store. It's like SOS pads...though I don't know if I would buy the ones with detergent infused in them. People have posted that you need to pack it in fairly snuggly and have reported that this works well.

Another thing you might consider is if you are going to get a dyno-tune done to your car, have the tuner omit the readings from those O2 sensors...they won't affect performance.

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