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Oxygen Sensor V70-XC70 1999

I brought an oxygen sensor for my car and it is an Universal from Bosch.
It has four wires. 2 white wires, 1 Gray, 1 black.
The oringinal has 2 black wires, 1 blue, and 1 white.
The instructions said since there is no polarity to the heaters, it is only important to match the color of the heater wires. Has anyone replaced an sensor before? I can match up two wires, but the other two, I am not sure. Any idea's

Thanks,
BOB







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