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I have been getting this code more frequently now, have been just clearing it the last few times but is arising more and more. I believe its an 02 sensor not sure which one or how to change it out. Any advice on this would be great Car is a 99 maxima 202,000miles.
 

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The PO136 code is the rear Heated Oxygen Sensor {Rear HO2S}. I believe this is attached to the "cat" as it is on a '95. I should just unscrew and have three wires. This adjusts the air-fuel ratio
 
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