The heater circuit in the upstream O2 sensor on bank 2 has failed.
Informational only. Consult a qualified mechanic.
Check fuse and replace sensor.
The P0155 OBD-II diagnostic trouble code (DTC) indicates: o2 sensor heater circuit b2s1. This is a low-severity powertrain code that your vehicle's onboard diagnostics system triggers when the heater circuit in the upstream o2 sensor on bank 2 has failed. If your check engine light is on with this code, the vehicle is generally safe to drive, but you should have it inspected soon.
Use Your Service Book to log this diagnostic trouble code to your vehicle's service history, track repairs, and get maintenance reminders — all for free.
Track codes on your vehicle — sign up free
Log OBD-II codes, get maintenance reminders, and keep your complete service history.