I have been told that the cause of black smoke on my 1993 Honda Civic could be due to the O2 sensor. I called the shops who informed me they have a 4 wire universal sensor that I would need to modify if I have a single wire O2 sensor.

I heard that there are 2 sensors on my car, where is the other one located and which of the two sensors play the part in the fuel/air mixture of my carby? That way, I will just change that one.

Here is a pic of my O2 sensor. Can someone please confirm if this is the O2 sensor and whether I am correct in saying that it is a single wire type??


Also the single wire runs to a connector mounted on the engine and then that connector runs to another connector that is mounted to the engine all by single wire. I presume it was to extend the wire since it doesn't look like its done for any other purpose.


How many types of O2 sensors are there and what should I get? Should I just buy any of should I try to locate a single wire, if it is possible??

What exaclty are the tools I need to perform this change?