Mil eliminators vs turning rear 02s off - Mustang Evolution

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Old 03-22-2015, 01:26 PM   #1
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Mil eliminators vs turning rear 02s off

So rear sensor on bank 2 is stuck lean.

However car is running normal. But every week mpg is decreasing from city 15 mpg a few weeks ago I'm now at about city 11 mpg now.

I didn't now that a rear 02 sensor can cause especially if running lean.

I have 3 options to try and cure this.

1. Mil eliminators. Removes cel. However will the car still run lean with these? Or does it simply ignore the codes.

2. Buy a new rear sensor and hopefully it goes away. And I that's not the issue I'm back at square one.

3. Turn off the rears. But how can I do this? And will turning them off have any effect on the car and if so, will still run lean with the 02s off?


Suggestions or opinions greatly appreciated.


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Old 03-22-2015, 01:45 PM   #2
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Originally Posted by alecas447 View Post
So rear sensor on bank 2 is stuck lean.

However car is running normal. But every week mpg is decreasing from city 15 mpg a few weeks ago I'm now at about city 11 mpg now.

I didn't now that a rear 02 sensor can cause especially if running lean.

I have 3 options to try and cure this.

1. Mil eliminators. Removes cel. However will the car still run lean with these? Or does it simply ignore the codes.

2. Buy a new rear sensor and hopefully it goes away. And I that's not the issue I'm back at square one.

3. Turn off the rears. But how can I do this? And will turning them off have any effect on the car and if so, will still run lean with the 02s off?


Suggestions or opinions greatly appreciated.


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Honestly man sounds like you need a tune to dial in the afr and turn the rear o2s off at the same, time. You just have the off road midpipe?

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Old 03-22-2015, 01:49 PM   #3
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First of all, the downstream 02 sensors are "test only". They do not provide any engine management data to the PCM.

What is the number of the code that keeps occurring?
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Old 03-22-2015, 01:50 PM   #4
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Should have a code for cat failure or something of the sort

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Old 03-22-2015, 01:56 PM   #5
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Honestly man sounds like you need a tune to dial in the afr and turn the rear o2s off at the same, time. You just have the off road midpipe?

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Nope I have catted x pipe. Which make it all the more confusing.

And it's there since I installed the x pipe
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Old 03-22-2015, 02:06 PM   #6
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.
http://www.obd-codes.com/p2272

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Old 03-22-2015, 02:08 PM   #7
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.
http://www.obd-codes.com/p2272

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I've seen all that


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Old 03-22-2015, 02:16 PM   #8
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I figured that you might have.

Since you have been getting this code after you did some exhaust work, I would pay particular attention to the part in the "symptoms" section that mentions exhaust leaks and loose 02 sensors.
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Old 03-22-2015, 02:16 PM   #9
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Mil eliminators vs turning rear 02s off

Just don't know what would be the best solution so you're saying the rears have nothing to do with the ecu?


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Old 03-22-2015, 02:21 PM   #10
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Just don't know what would be the best solution so you're saying the rears have nothing to do with the ecm?


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Yes.
It is the upstream sensors that provide the engine management data.

Check for any exhaust leaks first.
This can also be caused by the UPSTREAM 02 sensor.
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Old 03-22-2015, 02:32 PM   #11
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Yes.
It is the upstream sensors that provide the engine management data.

Check for any exhaust leaks first.
This can also be caused by the UPSTREAM 02 sensor.
Would bad o2s cause this or a bad connection?

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Old 03-22-2015, 02:41 PM   #12
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Would bad o2s cause this or a bad connection?

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Yes. It could be a bad upstream sensor on that bank.
A bad connection will typically set off a code for the 02 sensor almost immediately.

This can also be caused by a failed fuel injector on that bank.

I would carefully inspect all of the recent exhaust work though, since all of this started to occur after the X-pipe installation.
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Old 03-22-2015, 03:23 PM   #13
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Originally Posted by straybullitt View Post
Yes. It could be a bad upstream sensor on that bank.

A bad connection will typically set off a code for the 02 sensor almost immediately.



This can also be caused by a failed fuel injector on that bank.



I would carefully inspect all of the recent exhaust work though, since all of this started to occur after the X-pipe installation.

I'm going to be changing the mid pipe soon to o/r I'll see what codes I recieve afterwards


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Old 03-22-2015, 04:50 PM   #14
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I forgot to ask the mil will that turn the rears off? Or jut ignore the codes?


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Old 04-17-2015, 03:45 PM   #15
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Ok so it's been about a week since I replaced the x pipe with an h.

I'm not getting the sensor code anymore which is weird. However I am getting these but I know it's because I'm o/r now. However why isn't the bad 02 sensor showing anymore??? Confused😮😮😮Click image for larger version

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