So my car is a 1992 Civic SiRII, and it failed emissions testing due to high hydro carbons. I took the cat out as it looks old and am going to replace it, but when trying to take out some sensor at the end on the cat the bolt snapped and the sensor is stuck in the cat now. So heres my question, as far as I knew OBD1 motors only have 1 O2 sensor so what is this extra sensor in my CAT? Did EG6s come with two O2 sensors? I tried looking for this part on majestic honda but could not find it, I could only find the primary O2 sensor on the header. The sensor has two wires and it a little smaller than the primary O2 sensor.

 

anyone?

 

i think obd1 motors only have one o2 sensor. which is the one on the down pipe.
can anyone confirm this lol

 

I believe that sensor is to let you know if your cat is heating up, I don't believe it heats the cat up but it's the sensor for the light on the jdm clusters that have a pic of a cat with the wavy lines above it. Primary is before cat, secondary is after cat.