Does it work? Yes or No? How many miles has your light been off? Purchased a test pipe and gonna give it a whirl. Have a scan tool, so hopefully I will be able to fine tune

 

Didn't work on my X like it did for my S2k, IX, and wife's WRX. Just disable it within ECUFlash with Tephra or with a Cobb Accessport.

 

i bought the up test pipe and about 1 or 2 times a month i would get a light but after cobb tunned my car no more. that has been since may 2010

 

ETS Test Pipe with J Tube. No CEL. Driven about 400-500 miles on it so far.

 

I have had a mechanical fix on my Evo for approximately 8k miles. I run a resonated test pipe and the CEL fix has been successful. I also recently just passed NY state inspection.

 

I did this two years ago and driven 20,000+ miles never had a problem.

 

You almost need a third option, worked for a long time then starting coming on...

Basically any small exhaust leak can alter the balance of exhaust flow that reaches the rear O2 sensor and if there isn't enough it will also trigger a CEL. My light "mostly" stays off now but when I had the pre O2 exhaust leak it would trigger after only a few drives like clockwork. I tried all the ECU fix combos of settings and none of them stopped the codes. It was either flagging it as not efficient enough or no signal reaching the O2/heater. It seems that every car has a slightly different balance point so this is why some have problems while others never look back.

 

worked perfect for me , then i got tuned.

 

bought the 90 degree fix off ebay and put some pieces of the cat in the space between the sensor and the hole. its worked fine so far, about 4k miles or so.

 

If it's an '08 MR then no, the mechanical CEL fix won't work, although the Cobb AP has a fix for it.

 

Did it once, works perfectly. No CEL's for three years now.

 

Not worked for me (Ultimate Racing).

 

what code?

ive put up the P0140 code fix into my DTC Disable thread..

 

Didn't work for me, but the Cobb AP got the job done

 

So if im running say the stock mid pipe and stock cat, and bought a test pipe with an o2 bung. What do i do from there? buy a cel fix and hook up the o2 sensor?? can anyone shed somelight.