www.avigex.ca/xport/dtc13a.jpg and
www.avigex.ca/xport/dtc13b.jpg tells exactly the expected values and being expert in electronics, no problem in interpreting them. At this time,my problem is purely accessibility: the connector is located , but invisible deep between the engine and the firewall , so am unable to perform the disconnect and other unwanted priorities take my time. It will take a little time but will report findings as they come.. Of course checking continuity is a necessary step,
SOme years ago when I went for the rear spark plugs from under, the O2 sensor was seen as more accessible from that position ....
O2 sensor is original.