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P0051 - HO2S Heater Control Circuit Low Bank 2 Sensor 1

Possible causes
- Faulty Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1
- Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 harness is open shorted
- Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 circuit poor electrical connection
- Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 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.
When is the code detected?
The P0051 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)
P0051 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 P0051 - HO2S Heater Control Circuit Low Bank 2 Sensor 1 - AutoCodes.com
P0051 Information for specific makes
P0051 AUDI HO2S Heater Control Circuit Low Bank 2 Sensor 1  P0051 Image
P0051 BMW HO2S 21 Heater Control Circuit Low  P0051 Image
P0051 BUICK HO2S Heater Control Circuit Low Bank 2 Sensor 1
P0051 CADILLAC HO2S Heater Control Circuit Low Bank 2 Sensor 1
P0051 CHEVROLET HO2S Heater Control Circuit Low Bank 2 Sensor 1
P0051 CHRYSLER O2 Sensor 2/1 Heater Circuit Low  P0051 Image
P0051 DODGE O2 Sensor 2/1 Heater Circuit Low  P0051 Image
P0051 GMC HO2S Heater Control Circuit Low Bank 2 Sensor 1
P0051 HYUNDAI HO2S 21 Heater Circuit Low  P0051 Image
P0051 INFINITI HO2S21 Heater Control Circuit Low  P0051 Image
P0051 INFINITI-2 Air Fuel Ratio Sensor 1 Heater Bank 2 Control Circuit Low  P0051 Image
P0051 JEEP O2 Sensor 2/1 Heater Circuit Low  P0051 Image
P0051 KIA HO2S 21 Hater Circuit Low Input  P0051 Image
P0051 LEXUS Oxygen Sensor Heater Control Circuit Low Bank 2 Sensor 1  P0051 Image
P0051 MAZDA HO2S Heater Control Circuit Low Bank 2 Sensor 1  P0051 Image
P0051 MITSUBISHI Cylinder 2-3 Heated Oxygen Sensor Front Heater Control Circuit Low  P0051 Image
P0051 NISSAN HO2S21 Heater Control Circuit Low  P0051 Image
P0051 NISSAN-2 Air Fuel Ratio Sensor 1 Heater Bank 2 Control Circuit Low  P0051 Image
P0051 OLDSMOBILE HO2S Heater Control Circuit Low Bank 2 Sensor 1
P0051 PONTIAC HO2S Heater Control Circuit Low Bank 2 Sensor 1
P0051 SATURN HO2S Heater Control Circuit Low Bank 2 Sensor 1
P0051 SCION Oxygen Sensor Heater Control Circuit Low Bank 2 Sensor 1  P0051 Image
P0051 SUBARU HO2S21 Heater Control Circuit Low  P0051 Image
P0051 SUZUKI HO2S21 Heater Control Circuit Low  P0051 Image
P0051 TOYOTA Oxygen Sensor Heater Control Circuit Low Bank 2 Sensor 1  P0051 Image
P0051 VOLKSWAGEN HO2S Heater Control Circuit Low Bank 2 Sensor 1  P0051 Image
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