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P0031 - HO2S Heater Control Circuit Low Bank 1 Sensor 1

Possible causes
- Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1
- Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 harness is open shorted to ground
- Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit poor electrical connection
- Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit fuse
- Faulty Engine Control Module (ECM)
Tech notes
The code means that there is a problem with the heater element circuit of the heated oxygen sensor. Water getting inside the heated oxygen sensor connector can caused the heated oxygen sensor fuse to blow, which is a very common problem for this type codes. Before replacing the sensor, check for the condition of the heated oxygen sensor fuse and connectors.
HO2S Heater Control Circuit Low Bank 1 Sensor 1 is the generic definition for the P0031; however your vehicle's manufacturer may have a different definition and information for the P0031 code.
When is the code detected?
The P0031 is set when the ECM detects an excessively low voltage through the heated oxygen sensor heater circuit
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P0031 Description

Oxygen Sensors (O2S) or Heated Oxygen Sensors (HO2S) need to reach a minimum operating temperature of 750 degrees F to produce an accurate voltage signal. The faster the heated oxygen sensor reaches that temperature the faster the sensor will start sending an accurate signal to the Engine Control Module (ECM).

In order to achieve the require temperature, a heater element is included inside the heated oxygen sensor. The ECM controls the heated oxygen sensor heater element based on signals from the engine coolant temperature and engine load. The ECM controls the heater element circuit by allowing current flow to ground.

The ECM monitors the voltage signal received through the heater element circuit and determines the state of the circuit by comparing the voltage detected with the factory specifications.

OBDII Code P0031 - HO2S Heater Control Circuit Low Bank 1 Sensor 1 - AutoCodes.com
P0031 Information for specific makes
P0031 AUDI HO2S Heater Control Circuit Low Bank 1 Sensor 1  P0031 Image
P0031 BMW HO2S 11 Heater Control Circuit Low  P0031 Image
P0031 BUICK HO2S11 Heater Control Circuit Low Voltage  P0031 Image
P0031 CADILLAC HO2S11 Heater Control Circuit Low Voltage  P0031 Image
P0031 CHEVROLET HO2S11 Heater Control Circuit Low Voltage  P0031 Image
P0031 CHRYSLER O2 Sensor 1/1 Heater Circuit Low  P0031 Image
P0031 DODGE O2 Sensor 1/1 Heater Circuit Low  P0031 Image
P0031 GMC HO2S11 Heater Control Circuit Low Voltage  P0031 Image
P0031 HYUNDAI HO2S 11 Heater Circuit Low  P0031 Image
P0031 INFINITI HO2S11 Heater Control Circuit Low  P0031 Image
P0031 INFINITI-2 Air Fuel Ratio Sensor 1 Heater Bank 1 Control Circuit Low  P0031 Image
P0031 JEEP O2 Sensor 1/1 Heater Circuit Low  P0031 Image
P0031 KIA HO2S 11 Hater Circuit Low Input  P0031 Image
P0031 LAND-ROVER HO2S Heater Control Circuit Low Bank 1 Sensor 1
P0031 LEXUS Oxygen Sensor Heater Control Circuit Low Bank 1 Sensor 1  P0031 Image
P0031 MAZDA HO2S Heater Control Circuit Low  P0031 Image
P0031 MITSUBISHI Cylinder 1-4 Heated Oxygen Sensor Front Heater Control Circuit Low  P0031 Image
P0031 NISSAN HO2S11 Heater Control Circuit Low  P0031 Image
P0031 NISSAN-2 Air Fuel Ratio Sensor 1 Heater Bank 1 Control Circuit Low  P0031 Image
P0031 PONTIAC HO2S11 Heater Control Circuit Low Voltage  P0031 Image
P0031 SATURN HO2S11 Heater Control Circuit Low Voltage  P0031 Image
P0031 SCION Oxygen Sensor Heater Control Circuit Low Bank 1 Sensor 1  P0031 Image
P0031 SUBARU HO2S11 Heater Control Circuit Low  P0031 Image
P0031 SUZUKI HO2S11 Heater Control Circuit Low  P0031 Image
P0031 TOYOTA Oxygen Sensor Heater Control Circuit Low Bank 1 Sensor 1  P0031 Image
P0031 VOLKSWAGEN HO2S Heater Control Circuit Low Bank 1 Sensor 1  P0031 Image
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