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Unread 04-03-2013, 08:47 AM   #1
gothamtcb23
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05 wrangler unlimited engine light

Hey Guys or Gals

So I have a 2005 Wrangler Unlimited. It's got about 90,000 miles on it and it seems to run fine. The only thing is, my check engine light goes on a lot. Every time I run it through the computer, it comes up that the O2 Sensors need to be changed. But I have changed them at least 4 times in the past two years. So I'll change them, and then a few months later, the engine light is on again. It's frustrating and its slowly draining my wallet. Does somebody know why this happens and what I can do to fix it? Or is this just something I have to live with?


Thanks

Rich

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Unread 04-03-2013, 09:44 AM   #2
laybackman
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Quote:
Originally Posted by gothamtcb23 View Post
Hey Guys or Gals

So I have a 2005 Wrangler Unlimited. It's got about 90,000 miles on it and it seems to run fine. The only thing is, my check engine light goes on a lot. Every time I run it through the computer, it comes up that the O2 Sensors need to be changed. But I have changed them at least 4 times in the past two years. So I'll change them, and then a few months later, the engine light is on again. It's frustrating and its slowly draining my wallet. Does somebody know why this happens and what I can do to fix it? Or is this just something I have to live with?


Thanks

Rich
What specific OBD2 codes does the computer throw? Get them read for free at almost any parts store. If the codes indicate that the O2 sensor are out of range that could mean that they are working but your air fuel mix is off.
A really clogged air filter could do that. So could bad spark plugs.

Any type of air leak before the O2 sensor will set off the CEL and make the engine run rich because of a false lean condition.

Since you have pre and post cat converter O2 sensors they compare what goes into the cat and what comes out.

If the comparison does not show that the cat converters(s) did their job that may be the problem. The O2 sensor(s) are just the messenger(s). Don't kill ( or replace) the messenger!
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Unread 04-03-2013, 11:41 AM   #3
WhiteMtnJeep
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Get codes:

Key On, Key Off, Key On, Key Off, Key On then Stop! Do not go to start at any time. Codes will be displayed on the ODO.
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Unread 04-03-2013, 12:02 PM   #4
gothamtcb23
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Quote:
Originally Posted by FernBchJeep View Post
Get codes:

Key On, Key Off, Key On, Key Off, Key On then Stop! Do not go to start at any time. Codes will be displayed on the ODO.
Thanks for this trick. It came out P2098.
This means Downstream Fuel Trim System 2 Lean right?
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Unread 04-03-2013, 12:03 PM   #5
gothamtcb23
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Quote:
Originally Posted by laybackman View Post
What specific OBD2 codes does the computer throw? Get them read for free at almost any parts store. If the codes indicate that the O2 sensor are out of range that could mean that they are working but your air fuel mix is off.
A really clogged air filter could do that. So could bad spark plugs.

Any type of air leak before the O2 sensor will set off the CEL and make the engine run rich because of a false lean condition.

Since you have pre and post cat converter O2 sensors they compare what goes into the cat and what comes out.

If the comparison does not show that the cat converters(s) did their job that may be the problem. The O2 sensor(s) are just the messenger(s). Don't kill ( or replace) the messenger!
The specific codes that came up after the Key Trick were "P2098" That's Downstream Fuel Trim System 2 Lean

What do you suggest I do now?
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Unread 04-03-2013, 01:38 PM   #6
laybackman
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Same situation here;

http://www.jeepforum.com/forum/f67/c...o-rich-564411/

There is some indication that this could be a software problem. Especially when the dealer does the "you have bad gas" 'two step' BS excuse.
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