Check Engine with Tubi
 

After installing my Tubi Street (with cats) exhaust, I got a check engine light after driving 100 miles. I dropped by the dealer and they said it was a cat deficiency? Basically resulted from the aftermarket cats. They cleared it but told me I would prolly get the error again unless i get a tune for the car via aftermarket tuner? Is anyone have this issue and are there any work arounds?

I'm sorry, yes, check engine light.

I have the Milltek exhaust with 200 cell sport cats and no CEL (check engine light) and it's been several thousand miles since the install.

You're missing my point...click on my link above regarding bungs.

Cars that have 100cell cats will need a reflash. Tubi uses 200s?

Cel
 

I had the same problem . Just add O2 bung extentions to the oxygen sensors. Once in a while, I get a CEL. I got an inexpensive OBD II reader that resets the error code (430). Takes about 1 minute to reset the CEL.

http://www.autozone.com/autozone/cat...uestid=1523845

I had tubis for several thousand miles , no CELs ever. The tubis already have bung extensions I believe. Make sure the wires to the sensors are not grounding someplace. Yes, the tubis have 200 cel cats.

Your exhaust should not be throwing a CEL. It's either an install issue or bad cats.

That said, the bungs above are very effective and work on a car with NO cats so they can fix your issue if the cats are bad.

I installed the tubi's myself with a buddy and we double and triple check everything. We taped the o2 sensor up so they would not become damage. The check engine light that came on I believe was red. I had the dealer clear it and will check to see if it will come on again. The previous owner said it was installed on his vehicle for only 6 months before taking it off. Those that have check engine light, did you have the tubi exhaust?

I've had mine now for over 2K miles and never had a CEL. I installed it myself. Sounds like you've got a leak.

I have a Tubi race exhaust for my 997TT as well.
Get CEL quite often and needs to go back to dealer everytime and they charge me $70 every time!
Until now, I have evomsit software done by Rennsport-1. No more CEL!

It is bad that you didn't get the error code before reset; you don't know what side and what sensor has triggered it. I have heard that even professionals sometimes did manage to mess with the sensors, by breaking the wiring or simply putting the front sensor in the rear by mistake, what triggers the fault. So when you get the CEL again make sure that you get the code. I would not go with the bungs, because that is just tricking the system so it can't adjust to the real readings. Good luck, I hope there is nothing wrong with the cats (sometimes these exhaust get sold used because the original owner put leaded racing gas in and destroy the cats.)

where should i be checking for leaks?

on the joints.

I will contact the dealer again tomorrow or monday to get the exact code. The sensors were taped in the same position so they could not be mistakenly moved. I had to drive about 100 miles before the check engine light came on after the install. with the CEL, the car does not go in limp mode right?

No, it is just the light. You always need some time till it shows.

this is what i'm afraid of....

The ECU recycles every 30 miles, buy a cheap scanner from sears that can read and clear codes. You should not be getting CELs with a tubi. That being said, there are some 08-09 cars that are more sensitive to CELs for some reason.
Neil means the IC joints.

I ran the Tubi exhaust for 16 months before the Ruf conversion, never had a CEL. If you have a bad cat I'm sure it's an isolated event.

I will check to see if the light comes on again. The reason I got the tubi was from all my readings it sounded good and doesn't throw cel. I did get the exhaust used and the previous owner stated he had the exhaust for only 6 months and it threw no code. However he did have a tune along with the exhaust so maybe the tuner turned it off? Those with the tubi exhaust is the bung already built in or a separate piece that goes between the sensor

Doesn't sound right. If you have the tubi street you are not suppose to get a cell as they are high quality 200 cell cats. I currently have a tubi street and have not received any cell light. When you first got the exhaust did you check the inside of the cats? Sometimes you can get cats that have been crushed inside or bent. Should always check especially when getting a used one.

If your car is running poorly or idling bad, then you have a leak. Check you intercooler hoses both on the y-pipe and on the other end. The bumper has so be removed to check the other end that connects to your intercoolers.

Also, check the connection to your throttle body/plenum to see if it's loose.

As for the bungs, they are already built in.

the light came on again. will a generic obd II from the autozone be able to read the code or is it a propriety code that is being thrown for cat? I am about to head to get one so I can read the code and clear it. The car runs smoothly and I have checked for leaks.

Yes, most generic scanners will read and clear the code. You can then translate the code from any of a dozen online sources.

I got a generic obd II scanner today and read two codes off the car.

P0420 Catalyst System Efficiency Below Threshold (bank 1)
P0430 Catalyst System Efficiency Below Threshold (bank 2)

Does this mean my cats are flowing too well on my tubi or I have a bad o2 sensor or cat?

Inefficient cats.... be sure you didn't mix up the primary and secondary wires.

I think i found the problem. Look at the picture of the exhaust I purchased. The front and rear o2 sensor plugs are the same size. I was looking at tubi's website and also pictures of the Tubi in the FS section and notice that the rear o2 plug is longer because it has a "bung" installed. I think the previous owner's installer forgot to include the "bung" assuming it was for his new system. I will contact them tomorrow and check. Is this the problem?

I've had my Tubi "Race" for 1k miles and never had a CEL. I just ran 10 Gallons of 110 Leaded race fuel this weekend and NO CEL's. Its amazing how much smoother the car runs with 110 leaded, also sounds alittle quiter at cruise with it.

Maf
 

Check your MAFs - they can sometimes be the cause. They may just need cleaning or perhaps one needs replacing (they aren't expensive). Bung extensions are a good solution as well. Many dealers won't investigate as thoroughly as your tuner.
K.

If you look at the picture I posted, I think the seller forgot to send me the "bung" for the rear o2 sensor assuming he may need it for his future exhaust. From all the other pictures of the exhaust I have seen in the for sale section, the Tubi has a longer "bung" in the o2 slot closer to the muffler. Can anyone with the Tubi exhaust verify what i'm talking about?

Pictures of the tubi exhaust with the longer "bung" from two different sellers. I believe this comes factory from tubi.

I seem to recall my old Tubi had a short bung on it.

It's definitely a separate piece i've been through several exhausts currently a Fabspeed version 2 & one of them came with these,they are extensions for the sensors needed on some cars i guess ,i'm sure you can get them from any of the exhaust co ,i'd try Fabspeed 1st.BTW thats a Milltek in the pics currently looking to sell it or trade it for a Tubi.

You are correct, the tubi's do come with a bung, now we know why. You can get them from fvd, or even your local parts store where they are marketed as 'spark plug extensions', ~ 20$ pr.
You just need to add a pr of bungs, problem solved.

Didn't someone mentioned something about the bungs 33 posts ago? :)

Yes, someone mention the bung awhile ago however, i didn't know that the bung was a separate piece. I assume that the Tubi built the exhaust with a non removable bung.

TT,
Is there a particular size or length I should get?

996TTer... right on the $$$...

a leak could also effect EGT and cat efficiency. Hence why I always welded.

im getting a set of fvd catless exhaust system and was quoted $80 for a set of bungs. will these $20 bungs you are speaking of work the same way? any special way of installing them OR just screw in?

tia

ok my yet-as-uninstalled 200 cell Switzer system has short bungs, should I extend before install? No fun to do twice.