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2004Gx470 bank 1 sensor 1 location


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Recently got a P0031 code heater control circuit low bank 1 sensor 1 error and I need to locate that 02 sensor. 
Thanks for your time!

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Bank 1 Sensor 1 = This O2 sensor is located right before the catalytic converter, on the side with the Cylinder #1 that is Bank 1. 

The right way to tell which side is Bank 1 and which side is Bank 2 by using the following method:

Bank 1: It is the side which has the #1 cylinder. For instance, Cylinders 1 – 3 – 5 – 7

Bank 2: It is the side which has the #2 cylinder. For instance, Cylinders 2 – 4 – 6 – 8

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