my car is a 1999 civic ex that just got a b16a3 transplant and converted to obd1 via jumper harness, its throwing a code 41, which is the primary heated o2 sensor....any ideas on how to fix this?

i dont think that the o2 sensor on the cat is the primary, correct me if im wrong, but that one is not plugged in.

and from what i understand the problem is coming from the o2 sensor directly behind the cat.

thanks

 

The primary o2 is the first one, i think its on the header. Try replacing it, i dont know if its possible that you have connected the primary o2 into the secondary and its now throwing the 41.

 

when i checked, there were only 2 o2 sensors total, once on the cat that plugs in with the eingine wiring harness, and the other one is on the exhaust pipe that has wires running into the cabin...