afaik OBD1 spec calls for a heated o2 sensor.
My own car is an LX and it has always had a 4 wire o2 sensor.
My brother in laws 1990 LX has a 4 wire o2 sensor.
the 1990 DX he had before that had a 4 wire o2 sensor.
The hundreds of accords I worked on while managing a honda repair shop, being a mechanic and working as a parts puller and mechanic at a honda only salvage yard/repair shop....if they were 1990-1995 they were obd1 and had 4 wire o2 sensors. I have never seen an accord that is newer than 1990 and has a 1 wire o2 sensor, and doesnt have a check engine light. I would not be surprised if a few are out there, after all there were a very few late 1989 models that were obd1 compliant as well.
The different part numbers indicate a different length pigtail, and either male or female plugs....
My own car is an LX and it has always had a 4 wire o2 sensor.
My brother in laws 1990 LX has a 4 wire o2 sensor.
the 1990 DX he had before that had a 4 wire o2 sensor.
The hundreds of accords I worked on while managing a honda repair shop, being a mechanic and working as a parts puller and mechanic at a honda only salvage yard/repair shop....if they were 1990-1995 they were obd1 and had 4 wire o2 sensors. I have never seen an accord that is newer than 1990 and has a 1 wire o2 sensor, and doesnt have a check engine light. I would not be surprised if a few are out there, after all there were a very few late 1989 models that were obd1 compliant as well.
The different part numbers indicate a different length pigtail, and either male or female plugs....
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