John@Fabspeed

Tunnel runs...my favorite

CAlexio

Transformative isn't it?..

John@Fabspeed

We took your tunnel video and blew up facebook and instagram today by the way

You have any tunnels near you?

aryork

OP/ExtendedWarranty - are you still without a CEL? I just bought a pair of O2 spacers. Got a P2099 and 2097 with my sport headers. Exhaust header bolts are torqued properly (was not the last time I got 2099).

ExtendedWarranty

I've since then got a Fabspeed protune which got rid of the CELs

ExtendedWarranty

Changed out my OEM exhaust for the Fabspeed Lightweight exhaust to attach to my Fabspeed Race headers

Alan C.

One year in on my Dundon headers and no CEL.

rflavell

jadkar

I'm very interested in the statement..... "a pro-tune will get rid of the CEL on a catless system guaranteed". I'm curious if the problem is eliminated by tuning or is it by simply disabling the post O2 sensor functionality?? I need to know this because I have a CEL problem that I cannot solve.

My 997.2 tt was pro-tuned by RT tuning with a catless system and I obviously immediately threw codes regarding the malfunction of the post cat O2s. I subsequently bought mini-cats, installed them and now I have ....
P2270
P2099
P2272
P2097
P0041

I checked for leaks... nothing. I put the factory map back on and the same CELs came back. I live in NJ and I need to get inspected. If the pro-tune "guarantee" is to just disable the post O2 as to not set off the CEL that will be picked up by the Jersey testing process.

I need a better way and I have to crack this issue

aryork

Most tunes just hide the post-cat O2 sensor, but do not know for sure on yours.

I had similar issues and have written about it one at least one thread, but I'll give you a summary. I have Fabspeed sport headers and got a CEL late last year and my inspection ran out in January. I did a lot of looking at the O2 sensor voltages using the OBDII port and a KIWI dongle. I got the Fabspeed mini-cats and they did not make the CEL go away. In fact, I got another code "O2 sensor stuck lean" (which I believe is P2272) after installing the mini-cats. It was just on one side, and told me the mini-cats were actually working too well. I did not have time to keep messing around with it, so I put the OEM headers back on. CEL went away in about a week. I got the inspection. Yeah!

While the headers were off I had them ceramic coated with Cerakote (locally here in Raleigh). In addition, even though there's no evidence to show it helps, I washed the cats out with tons of Dawn and water. Reinstalled them in early March and no CEL since (say, in ~3 months of use including one track weekend). Could be the washing or maybe they are slightly hotter with the ceramic coating and working better.

If you don't want to mess with installing OEMs back on, you might try replacing the mini-cats with plain standoffs. That is, extend the distance from the exhaust to the O2 sensor, but just with plain, straight pipe instead of the mini-cat.

Another alternative is to have the codes reset and research the drive cycle to where it turns the "monitor complete" flag (or something like that) on. This is a flag that prevents you from resetting the codes and then immediately driving to get the inspection done. It involves several cold-to-hot cycles and some amount of miles. But, chances are you can emulate the drive cycle in a day and take it immediately to get inspected. But you should verify the cycle has been completed before taking it for inspection. I use the Dash Command app for iOS.