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O2 4 wire sensor wiring colors ?


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In my 1986 4WD turbo , EA82T wagon I would like to measure the O2 sensor.

It has a four wire , round connector.

One pair is for the pre-heating and one pair for ground and O2 sgnal for the ECM.

 

Sofar I could not find the correct wires and colors.....

Any help is welcome !

Thanks.

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