How to back probe a California O2 sensor - Hyundai Forums : Hyundai Forum
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post #1 of 7 (permalink) Old 04-20-2019, 07:43 PM Thread Starter
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How to back probe a California O2 sensor

Can someone please tell me how to back probe an upstream O2 sensor? Mine is California emission compliant with five wires. My Haynes manual had the wrong instructions for this sensor as it thinks I have a four wire sensor. None of the wire colors are correct, but I have checked and this sensor is OEM for this car in California.

Any help would be appreciated.
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post #2 of 7 (permalink) Old 04-24-2019, 02:40 AM
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Originally Posted by ArmyVulture View Post
Can someone please tell me how to back probe an upstream O2 sensor? Mine is California emission compliant with five wires. My Haynes manual had the wrong instructions for this sensor as it thinks I have a four wire sensor. None of the wire colors are correct, but I have checked and this sensor is OEM for this car in California.

Any help would be appreciated.
O2 sensor info attached.
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File Type: jpg Heated O2 Sensor.jpg (223.7 KB, 6 views)
File Type: jpg Connector C166.jpg (133.8 KB, 5 views)
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post #3 of 7 (permalink) Old 04-24-2019, 05:59 AM
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Can someone please tell me how to back probe an upstream O2 sensor?
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O2 sensor info attached.
Thanks, that really helps
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post #4 of 7 (permalink) Old 04-24-2019, 01:46 PM Thread Starter
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wongpfh, thanks for the information. I don't think my wire colors are the same as that schematic though. I will check and get back to you guys. I think mine was made by NTK.
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post #5 of 7 (permalink) Old 04-24-2019, 03:39 PM
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You don't have a standard O2 sensor. You have a Lambda or wide band sensor and they work totally different than a zirconia sensor. You'll get no useful information back probing anything but the heater circuit on a lambda or zirc sensor.
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post #6 of 7 (permalink) Old 04-24-2019, 03:49 PM
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I don't think my wire colors are the same as that schematic though... I think mine was made by NTK.
The wire colours in the schematic are the colours of the wires in the car's harness, not the wires on the sensor.
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post #7 of 7 (permalink) Old 04-25-2019, 06:34 PM Thread Starter
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Thanks for the input, everyone. It's appreciated.
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