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CEL still on even with O2 bung

 
Old Apr 6, 2014, 12:52 AM
  #16  
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Me too. Tried steel wool and put extra nonfoulers. I guess I'll just try to disable it when I get my cobb AP. And Im gonna need all your help again.
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Old Apr 6, 2014, 12:52 AM
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Originally Posted by TravisF View Post
The rear o2 wouldn't cause that. It's only purpose is to make sure the catalytic converter is doing it's job. The front o2 controls AFR in closed loop
I know that is the way most cars are, and my car is the 1st time I ever heard of it happening, but only just going in and checking the box to disable the rear O2 and not changing anything else makes my A/F ratio go crazy rich at idle/cruise. When we re-enable the rear O2 A/F ratio goes back to normal.
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Old Apr 6, 2014, 11:23 AM
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Originally Posted by _RMC_ View Post
Got a TurboXS HFC on my 14 EVO mr. Installed the L bung and I added the spark plug foulers so my rear o2 sensor would have a good distance but still my CEL is still on. Any suggestions? Thank you

Yes, I had the EXACT SAME ISSUE. Have a shop fab a new spacer. It needs to be in the shape of a j with a bend in it. It was the only way to correct the problem. Mine in a 12, but it's same set up.
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Old Apr 8, 2014, 11:02 AM
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will the vibrant o2 spacer be ok?
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Old Apr 8, 2014, 11:33 AM
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I'll also get a Cobb AP. Will try to disable the rear o2 sensor
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Old Apr 9, 2014, 09:51 PM
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So here's what happened.i flashed my ecu with a new map from my Ap. The cel turned off. After 50 miles went back on again but this time it gave me a P0296 code.
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Old Apr 10, 2014, 12:03 PM
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Did you mean P2096?
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Old Apr 10, 2014, 01:16 PM
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My bad. Yes its P2096
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Old Apr 11, 2014, 09:33 AM
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Ah! This one i know....

bank 1 sensor 2 O2 reads to[sic] lean

It is the second o2 sensor. I have the mini cat adapter. I only started getting the SES when cold weather hit the area and until Spring came!

Check for exhaust leak between dp and test pipe.

There is a 3" to 2.5" adapter that looks like it should help me.

It really only triggers after the car has been driven in cold weather and then warm It senses the change in last drive and the current drive to trigger the SES.

[shrug]
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Old Apr 21, 2014, 10:59 AM
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problem is it's turboxs
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Old Apr 22, 2014, 02:11 PM
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Originally Posted by RocketSkates14 View Post
problem is it's turboxs
Maybe, but if you make the fouler in a j shape.
Problem solved.
You may not like the exhaust, me personally I am extremly happy with end product . It's just the factory o2 sensor is really on when it comes to exhaust.

Disabling the rear 02 will not pass emissions , so that's why I had to get mind sorted out.

In the end very simple solution.

Last edited by Risky Guy; Apr 22, 2014 at 02:14 PM.
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Old Apr 23, 2014, 05:40 AM
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If there is no leak; take out the bung and get it tuned. That should take care of it...I'm pretty sure.
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Old Apr 23, 2014, 07:10 AM
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Originally Posted by stevenmalone View Post
If there is no leak; take out the bung and get it tuned. That should take care of it...I'm pretty sure.
Tune isn't the issue,mine was a pro tuned had exact same issue. It's the stock 02 is super sensitive. We tried to turn off the rear 02 & the ses light came back on within a few hundred miles. We did the bung replacement & it's been fine since then.
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Old Apr 23, 2014, 07:23 AM
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I had a smog about 3 weeks ago. I put the oem pipe back. I notice one of the nut/bolt was a little loose. After the smog I put the test pipe back and made sure everything was torqued down and haven't had a cel yet. I don't know it's the readjusting the pipe or the o2 sensor could have done it.

Last edited by SpeedI2acerX; Apr 23, 2014 at 07:29 AM.
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Old Dec 31, 2018, 09:58 PM
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Originally Posted by import111 View Post
What code are you getting? I had this issue for around a year and just finally figured it out after putting it off for a long time. If you are getting a P0140 you need to get rid of the spacers and just put the sensor in normally. That's what seems to be working for me.
I'm hoping you can help me. My Service Engine Soon light came on after 50 or so miles of driving with catless straight pipes so I put 2 defoulers on my rear 02 sensor (one drilled out to make room for the 02 sensor, another regular on on top), removed negative battery terminal, and drove without the SES light for about 50 miles and it came back on. Code is P0140. How would I know if the sensor was bad? Should i take one off and do a single drilled out spark plug non fouler?
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