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How do I replace the O2 sensor

  

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2002 Nissan Xterra 3.3l V6. How  an I easily or possibly remove upstream left o2 sensor? I can't really find a way to get good leverage and enough torque. I replaced the upstream left already with an extension. This other one however is in a tighter spot which an extension will not fit. I'm using a shorty with a ratchet just no leverage. 

 


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First you said you wanted to replace the upstream left 02 sensor.  Then you said you replaced the upstream left already with an extension.  Which is it?  Which 02 sensor are you trying to replace?


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