p7C

Alright i just bought back my civic from a friend that I had sold a year ago. Its running like complete crap the check engine light is on it needs an o2 sensor so i go to auto zone to get it tested and he prints out the code it says bank 1 sensor 2 oxygen sensor is bad. They could not tell me which sensor it was and told me to call the dealership and ask them so i do and they also didnt tell me anything. So i go home jack the car up to find the guy I bought the car back from took off the cat and welded some junk pipe up there and there is only one oxygen sensor there and all thats left of the second sensor is 4 wires hanging down. The sensor thats still there is the one closest to the front of the car. Just wondering if the oxygen sensor i need screws into the cat or a different piece of piping? And how would i go about putting a new one in can I buy the universal sensor and just wire it to the wires hanging down?

ezone

There's no point in doing one thing without taking care of it all.

If you fix the cut sensor and get it installed in the exhaust, it will set a cat code.