What does code P0156 mean?

O2 Sensor Circuit Malfunction (Bank 2, Sensor 2): The downstream O2 sensor on bank 2 is malfunctioning.

P0156 is rated as medium severity. Schedule service — affects performance or emissions.

P0156

O2 Sensor Circuit Malfunction (Bank 2, Sensor 2)

Powertrain Code · Medium

What does P0156 mean?

The downstream O2 sensor on bank 2 is malfunctioning.

System: O2 Sensor

P0156 is a powertrain diagnostic trouble code indicating o2 sensor circuit malfunction (bank 2, sensor 2). This code is classified as medium severity, which means: schedule service — affects performance or emissions.

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.