Really? i never had a CEL light and I live .3 miles away from a freeway.. I start up, warm up for 30 seconds and it takes me 2 minutes and i'm on the freeway.. but I drive easy till the car is warmed up.

 

Same here... I reset the codes and it only lasts for about a hundred miles. I've conditioned myself to ignore the CEL, doesn't seem to hurt the car or hinder performance.

 

You are adding nonfoulers to the ones already on the cats?

 

That's a surprising result!!! I definitely don't get that signature test pipe smell coming out of my exhaust, nor do I have that carbon buildup on my tips usually found on test pipe equiped cars. They're definitely cleaning something, but perhaps the O2 on the HR is more sensitive than on previous models.

 

was that hot or cold ? and i mean hot like after a good 20 minute drive .

 

My car threw the cat codes with the Berk's HFC's also. This happened twice after I reset it each time. I replaced the stock cats with the same O2 sensors and the codes did not come back (I drove a few thousand miles with the stock cats back on), so I dont think the O2 sensor was damaged. I did have the FI HFC's on for some time prior to the Berk's and didn't throw a code with those, but I can't remember exactly how long I had them on for.

I think either these cats flow very well leading to the codes, or the 07+ ECU is much more sensitive. Right now I am running the FI HFC's with the Nismo exhaust. Haven't driven enough to see any codes yet.

ncdoc

 

Well new o2 sensors and it still threw a CEL 0430. Then I jacked up the car and started it to find my left HFC just before the support bracket has CRACKED.

I am going to call Bryan and see what they will do for me. The CEL is because the air is leaking in and makeing the oxygen reading to high. So the ECU throws a 0430/0420.

 

I originally had planned to get the Berk HFC and reflash (already have exhaust), but if they are going to throw me a code, the HFC's look like a no go. Ah well...

 

So pretty much even though Berk is the best built HFC out there- it will still throw the CEL and cats will crack after a few months. Seems like the HR is cursed by the aftermarket.

 

Oh my gawd! I have my Nismo exhaust and Berk hfc's sitting in my room and am afraid that if I install them they will crack!!!!!!!

I don't know what to do. I need to find out the exact reason these are cracking. If it is the Y-pipe, then I will keep the stock y-pipe and install the rest of the Nismo exhaust. Can anybody comment on if this is a plausible idea?

 

Intalled my Nismo an Berks with Zero issues.

 

Thanks for the feedback.

It's not really the installment that is the problem, I believe over time there seems to be some stress on the cats, and I am wondering what it could be.

 

Mine cracked just above the suport brace bracket on the weld. It could have been a bad weld. Might only happen to 1-10000. I would install them and press on. If they break Berk will replace them.

 

is there a quick way to reset the CEL?? like pulling the cable off the battery for awhile??

i got my CEL within a day of putting on my HFC's. so i dont think they are cracked. although. stranger **** has happened.

 

You must have somehow faulted the O2 sensors.

I got my exhaust installed professionally and I have zero issues.

 

Mine did not show up until I had them 1000+ miles.

I use the pedal method for resting it

 

I am over 6000 miles with mine. Not a single issue, and not even a single a CEL. I used the Long Bung on the HFC’s, this is where my O2 is now located. I guess I should also say I am driving an 06.

 

link??

 

You could be on to something there. Generally this is the consensus on why its so important to let your car idle up every morning to operating temperature.
Same goes for 02 sensors. When the motor is not fully warmed up, identified by coolant temp, then the car is still running quite "rich". This being noted with high flow metallic catalytic converters which do not have the warm up cycle like stock, they could possibly take longer to "activate". In the end, if the car is not warmed up properly, its still running rich, and the 02 sensor would notice that your car is running "richer than normal" and trip the code.

I think that reads right.
And yes, primary O2's always read A/F ratio, the more O2 found in the exhaust the more lean the motor is running, secondary O2 read changes in gas change after catalytic converter activation.
-Jonathan