I have an OBD-1 B16 in my 96 coupe. I'm replacing my cat with a high-flow one. I was wondering if I need the sensor out of my cat to put into the high flow one? I thought OBD-1 motors only had a primary o2 sensor, not a secondary. Is this correct? Do I need that secondary o2 sensor in the cat? It looks like someone tack-welded the s.o.b. into the stock cat, and probably isn't coming out anytime soon. Thanks in advance.

 

If you have an OBD1 ECU, it won't be looking for a second oxygen sensor, so you may remove it entirely.

 

Just make sure to tape off the plug and stick it in the body of the car, I chose to let it dangle, and 5 months later I had CEL's for the O2, VSS, ELD, ECT and the ALT/SP SENSOR fuse blown when the key was turned, and the alternator would not charge the battery, all because of one shorted wire...