Howdy. So I had a catalytic converter welded on to my car today. The o2 sensor wires were cut right before the plug. I crimped on a new plug. My problem is this... There are two black wires that go from the o2 to the plug. I tried the wires both ways and my car still threw CEL 65 - Secondary oxygen sensor heater wire (black wires). My car is still throwing that cel after trying to connect the wires both ways. Any advice? This is a 97 civic with a 98 ls motor in it. Thanks a lot guys.