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I've looked at it already. I'm not sure if I understand it completely, but it seems like the 5 --> 4 wire conversion is because the new engine needs a 4 wire sensor. My car, however, needs a 5 wire sensor. So, I guess my question is, will a 4 wire sensor work with a car that needs a 5 wire...

I have a 98 Civic HX, MT. It has a 5-wire O2 sensor that I think is bad. I want to replace it, but I don't want to spend $300 for an OEM one. The universal ones cost about $60 but only have 4 wires. Is it possible to connect a 4 wire universal O2 sensor to the original 5-wire harness? Thanks!