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Unread 07-16-2011, 09:50 PM   #1
05RedRME
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code P2096

So my check engine light came on and the error code is P2096. I got a print out from auto zone and the definition is: downstream fuel system 1/2 lean. With probable causes: exhaust leak, engine mechanical fault, 02 sensor fault, or fuel contamination. The counter guy said more than likely it's the 02 sensor but I wanna see what others think before I start replacing parts. Jeep is an 05 with 72,000 miles. Any input would be appreciated. Thanks

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Unread 07-16-2011, 10:30 PM   #2
JPNinPA
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I got that when I ran my tank down to below E. I filled the full 19+ gallons. It went away.
What the of exhaust manifold/header do you have?
Could be the O2 but this is one I'd reset fill up an throw some injector cleaner in and see if it comes back. If you change O2's use OEM.
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Unread 07-17-2011, 11:31 AM   #3
05RedRME
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It has the factory exhaust manifold still.
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Unread 07-17-2011, 10:13 PM   #4
05RedRME
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Anyone...
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Unread 07-17-2011, 10:17 PM   #5
Heath
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Did you start by checking the things the code referenced?
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Unread 07-17-2011, 10:25 PM   #6
chris142
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exhaust leak--------Can you hear an exhaust leak? Not very common with the cast iron header you have.

engine mechanical fault--------Run ok? idle smooth? Probly ok here.

02 sensor fault--------Possibility.

fuel contamination--------Possibility. Run a couple of tanks of gas through it and see if the light comes back on.
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Unread 07-18-2011, 07:24 PM   #7
05RedRME
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No exhaust leak.
Runs fine, idles smooth

So that leaves bad fuel or 02 sensor. Should clear the code out and see if it comes back on after some fresh fuel? At what mileage do 02 sensors usually go bad?
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Unread 07-18-2011, 07:46 PM   #8
chris142
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Quote:
Originally Posted by 05RedRME View Post
At what mileage do 02 sensors usually go bad?
Usually around 80-100k. But like anything electronic some fail sooner and others last forever.
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Unread 07-18-2011, 09:12 PM   #9
Jetscuh
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I battled with this code on my '05 TJ with 55,000 miles.


What ended up solving the problem was replacing an O2 sensor. Bank 1, sensor 2. Go pick up an NTK (made by NGK) sensor and replace the one that's in there.
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Unread 07-19-2011, 03:35 PM   #10
05RedRME
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Do I want: rear; post cat (downstream) or front; post cat (downstream)? And do the NTK sensors work as good as OEM? Cause I know some brands don't work to well in Jeep's.
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Unread 07-19-2011, 03:41 PM   #11
Jetscuh
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Quote:
Originally Posted by 05RedRME View Post
Do I want: rear; post cat (downstream) or front; post cat (downstream)? And do the NTK sensors work as good as OEM? Cause I know some brands don't work to well in Jeep's.
You would want to replace the front sensor, post cat.

NTK do work as well as OEM. Jeep actually used NGK/NTK from the factory for certain years (parts included sensors and spark plugs). Bosch is what you'd want to stay away from as they don't always get along as well with Jeeps.
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Unread 07-19-2011, 04:43 PM   #12
05RedRME
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OK, Thanks for the help. Hopefully this weekend I can change it out and take care of the issue.
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Unread 07-19-2011, 06:28 PM   #13
bonza
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I had code P2098 come up last week. same as P2096 but the other post cat sensor.

this is the second time my Jeep has thrown this code. first time was a few thousand miles ago, cleared the code, checked for exhaust leaks, re-tensioned the manifold and header pipes and thought I had nailed it, then it re-appears again last week. maybe replacing the post cat o2 sensor is the cure
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Unread 09-15-2011, 08:16 PM   #14
05RedRME
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So I replaced the suggested sensor and cleared the code out and everything was fine, two weeks after, the code came back. What should I look into now?
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Unread 09-15-2011, 10:58 PM   #15
Sccafire
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There is a TSB for those codes. You will need to take it to the dealer and have the PCM reprogramed.

TSB NUMBER: 18-028-06

I had it done 3 or 4 years ago and have had no issues since.

Also recall D46. They will also reprogram PCM for emissions.
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