My son has a 93 Honda Civic CX that we are fixing up.
Not sure how much the engine has been modified but it seems obvious some changes have been made.
Right now struggling with oxygen sensor connection, oxygen sensor is there, wires coming off and are terminated with metal flat leads (no connector).
Pretty sure I found the right connector at a junk yard, but strangely I don't see an unused connector on the wiring harness to plug into.

appreciate any advice, thanks, Scott

 

Picture.
WHat engine is in it?

 

It's a D15B8 (stamped on engine block).

attached is picture of sensor and (no) connection

 

The CX uses a 1 wire 02 sensor not a four wire.

 

Check under the car, where the headers connect to the b-pipe and see if you can locate the plug somewhere in that area.

 

I take that back I guess the California emissions CX had a 4 wire O2. Both were on top of the exhaust manifold however

49 State


California

 

Could they have used an integra harness instead of the original cx harness? Hmm... Turbo manifold.....

 

It appears the headers have been changed to ones from a D15B7 instead of the stock ones with the combo header-cat converter contraption seen in the parts diagram above. This is fairly common enough (annoyingly), but it means you need to look under the car to ensure there is a cat on the B-pipe.

Anyway, this might explain why there's a 4-wire O2 sensor there instead of the normal 1-wire CX one. Unless it's a Cali car, in which case OP is home free... unless it doesn't pass emissions due to the modified setup.

OP: Your mission, should you choose to accept it, is to check if the car is a California emissions car. Read us off the part # on the ECU as that will answer this question, and direct my next instruction as to how the O2 sensor should be wired up.