binkyrules Posted March 11, 2021 Share 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! Quote Link to comment Share on other sites More sharing options...
Lexus Owners Club Posted March 11, 2021 Share 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 Quote Link to comment Share on other sites More sharing options...
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