Hi fellow enthusiasts. I am new to the forum and s2000's but not Hondas. I bought an 03 which soon after started to sputter at low rpms at the beginning of each gear.I was told my cat was clogged by the Honda dealer so I installed an Invidia 70mm test pipe with cell fix. The car ran fine for awhile, but after a few hundred miles the check light came on and the problem just won't go away. I replaced both 02 sensors with no luck. Im getting code p0420 catalyst system efficiency below threshold. Do I add another 02 sensor spacer? Any help would be appreciated.

 

The integrated Invidia CEL fix is useless, you need to ad a spacer to not get a code.

 

Ok I will try that. Thank you

 

The SOS 70mm test pipe comes with a built in cel fix and at the time untuned it worked, just for future buyers u need the spacer like said.

Honestly IMO invidia doesn't compete on S2K's level, they are the obx of the civic world. I'll leave it at that, at my point I'm not using the secondary and honestly if u put a tp in, you can't no matter what soo getting it with, it is just convenience not having to worry about it. To each there own

 

I picked up a spacer today so I will see if adding a 2nd spacer works.I just want it to run like stock... Always something