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P0037-o2 Sensor 1/2 Circuit Low
P0137-o2 Sensor 1/2 Circuit Low


Guys, I am getting these two codes. I have been running around on level 5 on the Edge juice/att. Could this be why the O2 sensor is going away? How do I tell which sensor this is?
 

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You may think about pulling the sensors out and giving them a good cleaning. Thats what the dealer would do.
 

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what is safe to clean them with.
 
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