AG94

Brought my car to autozone today to use their free code reader and the code p0135 came up (O2 sensor heater circuit malfunction). My check engine light is not on and I have no symptoms of a bad O2 sensor. Is it possible this code is saved from a while back? (I had an O2 sensor replaced years ago).

Also, yesterday I took out my IAT sensor to clean and forgot to plug back in the wiring before starting the car, which caused the CEL to come on. I plugged the wiring in and disconnected the battery for 10 minutes before restarting the car and the light disappeared. It hasn't turned back on after 30 miles of driving today. Could the unplugged IAT sensor have caused this p0135 fault code, I don't think the two are related but the absence of any fault code regarding the IAT makes me think it's possible