What does code P0031 mean?

HO2S Heater Control Circuit Low (Bank 1, Sensor 1): Low voltage in the HO2S heater circuit — possible open circuit or relay failure.

P0031 is rated as low severity. Minor issue — monitor and fix at convenience.

P0031

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

Powertrain Code · Low

What does P0031 mean?

Low voltage in the HO2S heater circuit — possible open circuit or relay failure.

System: O2 Sensor

P0031 is a powertrain diagnostic trouble code indicating ho2s heater control circuit low (bank 1, 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.