My car issued code P0155 today. Got it scanned at autozone...the morons couldnt even tell me what it meant exactly. It was something like oxygen sensor bank 2. Does this mean I have a bad sensor...or did one of my O2 sims go bad? Any ideas?

 

P0155 = Heated Oxygen Sensor (HO2S) heater circuit Bank 2 Sensor 1

That means the heating element in the pre-cat O2 sensor on the passenger side is not working. The sensor may be working, but the heating element isn't. Could be a problem with the wires that supply +12V to the heating element in the sensor, a bad pin on the harness connector, or a burned out heating element in the sensor. You could check the wiring harness with a volt meter to see if you get +12V across the black and brown wires in the harness connector. If you have the voltage there, the sensor is bad.

 

Hey thanks man...I'll just throw a new o2 sensor in then.