P0138 annoying code
06-30-2010, 12:39 PM
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Year: 1999
Model: Cherokee
Engine: 4.0
P0138 annoying code
Ok, I had the P0138 code, comes and goes. I reset it. It came back, P0138 is for the o2 sensor. I replaced my upstream sensor. Came home a bit ago, CEL on again, P0138. WTF? Is it an error code, just popping up for ha ha's? OR do I need a downstream sensor? I looked it up and it also says possible 12v power short. P0138 is o2 sensor over volts? Any info would be great.
03-19-2011, 12:24 PM
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Year: 1996
Model: Cherokee
Engine: 4.0 IL6
Yah, this happened to me, it would throw the code randomly, over a few months. I just replaced the downstream o2 yesterday and it hasn't thrown it just yet...but yeah, check your fuses first.
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