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02 wire is in the small harness that comes over side of block above the oil filter
Has lots of black wires that go to the big bolt on side of block
Should be a purple wire
You can find the wire coming from the ECM and solder the two wires together after removing the connector from the one from the ECM or you can get a new O2 sensor, which will come with a wire with the connector. They are about $ 20.00 here in the USA but probably more expensive where you are.
The O2 sensor wire comes out of the same corrugated loom as the block grounds and the oil temperature sender. I downloaded this picture from somewhere recently. The O2 sensor wire is the violet one wrapped around the wiring loom in this picture. It has the same one-pin connector as the EGR temperature switch and the EST connector.
I was lloking at the area last night. and is a mess. I will try to take some picture todays. I think I found the o2 wire. it have a conector at the end. but I also found another wire.
just to give you an idea. the ground cable on the picture above. are screw it to the intake on top of motor