What does code P0155 mean?

O2 Sensor Heater Circuit Malfunction (Bank 2, Sensor 1): The heater circuit in the upstream O2 sensor on bank 2 has failed.

P0155 is rated as low severity. Minor issue — monitor and fix at convenience.

P0155

O2 Sensor Heater Circuit Malfunction (Bank 2, Sensor 1)

Powertrain Code · Low

What does P0155 mean?

The heater circuit in the upstream O2 sensor on bank 2 has failed.

System: O2 Sensor

P0155 is a powertrain diagnostic trouble code indicating o2 sensor heater circuit malfunction (bank 2, sensor 1). This code is classified as low severity, which means: minor issue — monitor and fix at convenience.

Diagnostic data on this page is compiled from publicly available repair resources and technical service bulletins. Always have a qualified mechanic confirm the diagnosis before authorizing repairs on your vehicle.