Question on BMW 3-Series E36 O2_Sensor

I have a check engine light on and replaced both front 02 sensors and the light is still on. My mechanic tells me that I have a shorted wire on the Engine harness for O2 sensor , which is actually the wire that runs from the engine to the back and connects to the O2 sensor by the catalytic. I've been looking foer that part and have not been able to find it at the dealer or junk yard. can you advice as to what I need to do to get this problem fixed.
thanks



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[Nick at Pelican Parts]

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