What does code P0051 mean?

HO2S Heater Control Circuit Low (Bank 2, Sensor 1): Low voltage in the HO2S heater circuit on bank 2, sensor 1.

P0051 is rated as low severity. Minor issue — monitor and fix at convenience.

P0051

HO2S Heater Control Circuit Low (Bank 2, Sensor 1)

Powertrain Code · Low

What does P0051 mean?

Low voltage in the HO2S heater circuit on bank 2, sensor 1.

System: O2 Sensor

P0051 is a powertrain diagnostic trouble code indicating ho2s heater control circuit low (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.