Testing O2 sensor for the car engine

starLED said:

I have the BOSCH - 0 258 986 602 O2 sensor for the car engine which I want to test without installing it in the car to see if it's working properly.
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Now, there is a way to test it as described in the video
How To Test Heated Oxygen Sensors(O2 Sensors) Without A Propane Torch

I don't have a power supply, so I want to use AC-DC adapter 12V 2A as a power supply.

View attachment 147157

What I need is an advice how to connect sensor wires to the adapter jack without stripping the wires of adapter.
Does someone have a practical idea?

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starLED said:

I tested the sensor, and it seems that it works fine.
Sensor gets hot when connected to 12V, indicating the heater is working.
After a couple of minutes, signal was stable at 4 mV.
In YT video the candle was used to test the signal when oxygen was low.
I tested the other way around, I blow air to the sensor supplying it with more oxygen, and signal was getting lower to 1 mV as it should, and coming back on to 4 mV.
So, my opinion is that the sensor is ok, but will have to check when installed in car.

Only thing that I am confused is, why is the sensor ground wire grey?
There are 4 wires, two white and one black and one grey.
Two white wires are heater wires, and black and grey are signal.
I expected the black wire car wrap advertising to be the ground wire.

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