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Forward oxygen sensor replacement / wiring harness 850 1995

I have a 4-3-5 fault code on my 1995 T5R indicating that the forward oxygen sensor is malfunctioning. Some suppliers state that new wiring harnesses have to be installed on both oxygen sensors even when replacinf only one of them.
Can anyone clarify what is required when replacing the front sensor and who is a good parts supplier.
Thanks






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