ok guys i just swap a b18c1 in my 92 hatch, i ran the original obd1 harness off the gsr and near the shock tower theres an extra sensor hanging??? as for the cel its throwing a code 23 and 41? i know its the knock sensor for 23 and o2 sensor heater for 41, well my question is why n wat is the extra sensor for? is my knock sensor bad? do i have to replace it? and for 41 is that the o2 sensor on headers? sorry bout all the question im just tired of trying to make my car run right so i can state reff smog it n leave it as is....for any answers or opinion are greatly appreciated thnks...