How do I fix the P0155 code on my Ford – O2 sensor heater circuit issue?

[Nicko]

Hey everyone, I’m dealing with a P0155 code on my 2006 Ford Taurus, which I think is related to the O2 sensor’s heater circuit. I’m getting poor fuel economy and some rough idling. I’ve checked the wiring, and it looks fine. Is my next step replacing the O2 sensor, or could there be something else causing the issue?