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Unread 07-26-2010, 08:35 PM   #1
Big_Daddy_75
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Oxygen Sensor keeps going bad

I have a 1997 TJ 2.5L 5 speed with 174,000 miles on it. I have now gone through 2 oxygen sensors since I have owned it (3 years 1500 miles). The last one lasted about 300 miles and now I am getting a code and the jeep is running rich again. The last owner drive it a while with it like with it running rich. I knew this and when I checked the jeep out I saw a broken wire on the sensor. Replace it for the first time. I am not losing coolant and my engine temp is good. I have no white smoke and oil looked fine last change.

Any ideas why they the o2 sensor keeps going bad?


Thanks for the help and I would not have been able to lift my jeep without this forum. THANKS!

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Unread 07-26-2010, 09:42 PM   #2
cj847
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What code are you getting? How are you determining the sensor is bad?
If you have a rich condition, I doubt the O2 sensor is bad.
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Unread 07-26-2010, 09:46 PM   #3
Jerry Bransford
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Is there any chance the 02 sensors have gotten any whiffs of silicone caulking? An 02 sensor can die quickly if it gets around any fresh uncured silicone glue or caulking.
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Unread 07-26-2010, 10:18 PM   #4
Big_Daddy_75
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This is the key code I am getting. Code 51 A lean air/fuel mixture has been indicated by an abnormally rich correction factor. I will take it to an Autozone to have it read in the next few days.

I almost sure they have not touch any silicone.
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Unread 07-26-2010, 10:26 PM   #5
Jerry Bransford
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Quote:
Originally Posted by Big_Daddy_75 View Post
I almost sure they have not touch any silicone.
It doesn't need to touch it, an 02 sensor just needs a good strong whiff of silicone to go bad.
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Unread 07-27-2010, 07:59 AM   #6
Big_Daddy_75
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I don't think there has been silicone anywhere near the sensor. This last one went right in from the box.
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Unread 07-27-2010, 08:40 AM   #7
Sundowner
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What brand of sensors are they?
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Unread 07-27-2010, 11:10 AM   #8
ElementX
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Since you mentioned the original wiring being broken, maybe the wiring got corroded and high resistance is burning them out, or you have bare wire somewhere shorting. Any exhaust leaks? Specifically at the header bolts or cat?
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Unread 07-27-2010, 11:42 AM   #9
Big_Daddy_75
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The first was a Bosch and the one I just put in was a NKG.

The wire that was broken was right at the end of the sensor but I will take a closer look.
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Unread 07-27-2010, 07:28 PM   #10
cj847
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Out of the several hundred OBD II codes that may be set, not one of them is "O2 sensor bad". Since you just replaced it, I would not assume it bad again.

Sure, your O2 sensor may be bad, but my suggestion is you fix your wiring problem, or your vacuum leak, or leaky fuel injector, or incorrect fuel pressure.

PS> The lean/rich codes are two trip codes. So, if you reset the code and make a trip without of CEL it doesn't mean you fixed it yet. You need to take a few individual trips without a CEL to confirm.

Good luck with it. That code is sometimes hard to properly diagnose and fix.
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Unread 08-25-2010, 06:14 PM   #11
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Quote:
Originally Posted by Jerry Bransford View Post
It doesn't need to touch it, an 02 sensor just needs a good strong whiff of silicone to go bad.
It's not that I don't believe you Jerry, but HUH?
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Unread 08-25-2010, 07:31 PM   #12
Jerry Bransford
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Originally Posted by scottbr View Post
It's not that I don't believe you Jerry, but HUH?
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Unread 08-25-2010, 08:15 PM   #13
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Ya learn something new every day. Thanks!
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