I got lucky had a vx wire harness cut the 5 wire o2 sensor connector off then soldered my extra wires that were made from the obd 0-1harness to that sensor then pluged in the new o2 and ta-dah no problems since
Your cheap eBay harness sounds like the problem get a new one made for a p07 ecu with the wires for our 5 wire o2
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