First time poster and I did a very dilligent search first. A friends Accord has a hard code 41 engine cold or warm. Tested the heater circuit to the Oxygen sensor and have 12 volts, tested for a voltage variance revving up the engine and no change. Also tested the 3 pins on the Oxy sensor side of the connector and had no continuity. Everything points to a faulty O2 sensor but it looks rather new? Would replacing the sensor seem correct or because of no voltage change during different RPM's would I suspect wiring to it? Thanks in advance.

 

I don't know but it may seem like it needs an 02 sensor if its throwing that code but getting a new isn't cheap either.