hatchedlsvtec
Large Member
Just finished the lsvtec swap in a 91 civic. ECU throws a code 41 for o2 sensor circuit malfunction. I currently have the stock civic o2 sensor with one wire hooked up, so I assume the obd1 vtec ecu is looking for a 4 wire o2. I have the obd0-obd1 conversion harness in place with supplied wires for this sensor, they are not connected to anything at the moment. I suppose I would need to get a gsr o2 sensor with 4 wires and just hook them up, huh. Confirmation? Info? Thanks