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01 Pathfinder O2 Sensors


ryjaytay38
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Hey guys,

I just got another check engine light last night. Checked it and once again, its bank 1 sensor 1 oxygen sensor. This wouldn't make me think anything, except this is the 3rd one in a year. No issues with any other o2 sensors. What could be fouling this one in particular? The gas mileage doesn't change that much. I mean, it can't get a lot worse, but I love the truck so I keep it. It's been driving great and I just wondered what I might look for that could cause only this o2 sensor to go south.

Thanks in advance!

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No, if I clear the code, it stays gone until I shut down. As soon as I start the truck up again, there it is. I don't have any issues with any other o2 sensors. Each time it fouls, when I pull it out, it looks used but not like many I've seen. 

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