Sorry if this has been covered already, but in searching the forum I did not see my specific issuse
I got a P0031 Code (HO2S Heater Control Circuit Low Bank1 Sensor1)
From the research I did this seems to indicate a faulty heater element in the O2 sensor. By the official GX470 service manual the test is to check resistance across the two same colored wires (black) as these are the heating wires (the other two are the data transmitting wires). Acceptable range is 11-16 Ohms.
I pulled the Driver side (Bank1) O2 Sensor upstream of the CAT (Sensor1) and when I took an Ohm reading it was 2.9. Ok so bad O2 sensor, well below the proper operating range. I then purchased a new OEM Denso O2 sensor, same part number, and when I tested its resistance, I got the same 2.9. So, I disconnected the harness on the passenger side O2 Sensor (Bank2 Sensor1) and again got 2.9. I tried this test with two different multimeters.
I am throughly confused why I got these results. Any advice would be helpful
Thanks
I got a P0031 Code (HO2S Heater Control Circuit Low Bank1 Sensor1)
From the research I did this seems to indicate a faulty heater element in the O2 sensor. By the official GX470 service manual the test is to check resistance across the two same colored wires (black) as these are the heating wires (the other two are the data transmitting wires). Acceptable range is 11-16 Ohms.
I pulled the Driver side (Bank1) O2 Sensor upstream of the CAT (Sensor1) and when I took an Ohm reading it was 2.9. Ok so bad O2 sensor, well below the proper operating range. I then purchased a new OEM Denso O2 sensor, same part number, and when I tested its resistance, I got the same 2.9. So, I disconnected the harness on the passenger side O2 Sensor (Bank2 Sensor1) and again got 2.9. I tried this test with two different multimeters.
I am throughly confused why I got these results. Any advice would be helpful
Thanks