Hello guys, I am currently working on a 1989 Honda prelude SI and i ran into the issue that on of the cables of the oxygen sensor is not connected to anything. Its a red cable that is just hanging there. I anyone could send me a picture of how the connections on the o2 sensor are it would help me out a lot.

Thanks.

 

that's a b20a5 motor, which uses two single-wire o2 sensors in the exhaust manifold. the 90-91 b21a1 motor uses a single 4-wire sensor behind the motor. What you have there is the wrong o2 sensor, hence the jacked up wiring. Post a pic of the exhaust manifold, my guess is they either used the wrong header/manifold, or somebody decided to get creative and screwed up.

 

also, join the facebook group "3rd gen prelude enthusiasts"

 

That throttle cable splice.....holy ****.

 

lol I didn't even see that. Nice catch.
I think this is the car currently for sale in Exeter NH for $300