binkyrules Posted March 11, 2021 Posted March 11, 2021 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!
Lexus Owners Club Posted March 11, 2021 Posted March 11, 2021 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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