02 Sensor issues after engine swap.
Posted: Sat Mar 21, 2020 1:35 pm
Hey,
I have a 05 Honda Civic SI EM2 with a k20a type r dc5 engine with kpro on the jdm ecu. Last fall i pulled the engine for a winter rebuild. When I dropped the exhaust manifold I forgot to unplug my hybrid racing 02 harness. The wires on the harness side pulled out from the plug. When I parked the car last fall I had absolutely no engine codes. Never had an 02 problem. I found a diagram online for the plug but I think it was wrong and I had the wires pinned incorrectly for a day. I found an actual picture of the harness online and re pinned it correctly but I am still getting P1166. When I checked the relay for the 02 sensor the white wire for 02 power (pin 87 on the relay) is a bit deformed as if it got hot. I replaced the relay which is clicking fine with engine running/ignition on cranking.
I tested the heater circuit on the oxygen sensor itself and I am getting 1.3 ohms of resistance.
Is it possible the ECU circuit is fried or should I try to replace the sensor?
I have a 05 Honda Civic SI EM2 with a k20a type r dc5 engine with kpro on the jdm ecu. Last fall i pulled the engine for a winter rebuild. When I dropped the exhaust manifold I forgot to unplug my hybrid racing 02 harness. The wires on the harness side pulled out from the plug. When I parked the car last fall I had absolutely no engine codes. Never had an 02 problem. I found a diagram online for the plug but I think it was wrong and I had the wires pinned incorrectly for a day. I found an actual picture of the harness online and re pinned it correctly but I am still getting P1166. When I checked the relay for the 02 sensor the white wire for 02 power (pin 87 on the relay) is a bit deformed as if it got hot. I replaced the relay which is clicking fine with engine running/ignition on cranking.
I tested the heater circuit on the oxygen sensor itself and I am getting 1.3 ohms of resistance.
Is it possible the ECU circuit is fried or should I try to replace the sensor?