Engine-Codes -
Generic -
P0151
P0151 - O2 Sensor Circuit Low Voltage Bank 2 Sensor 1
Table of contents
P0151 Possible Causes
- Faulty Front Heated Oxygen Sensor Bank 2
- Front Heated Oxygen Sensor Bank 2 harness is open or shorted
- Front Heated Oxygen Sensor Bank 2 circuit poor electrical connection
- Inappropriate fuel pressure
- Faulty fuel injectors
- Intake air leaks may be faulty
- Exhaust gas leaks
How is the P0151 code repair?
Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.What is the cost to diagnose the P0151 code
Labor: 1.0
The cost to diagnose the P0151 code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.
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When is the code detected?
The voltage signal from the sensor is lower than the specified time.Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- High Fuel Consumption
- Excessive smoke from Exhaust
P0151 Meaning
The front heated oxygen sensor (or O2 sensor 1) is placed into the exhaust manifold. It detects the amount of oxygen in the exhaust gas compared to the outside air. The heated oxygen sensor 1 has a closed-end tube made of ceramic zirconia. The zirconia generates voltage from approximately 1V in richer conditions to 0V in leaner conditions. The heated oxygen sensor 1 signal is sent to the Engine Control Module (ECM). The ECM adjusts the injection pulse duration to achieve the ideal air-fuel ratio. The ideal air-fuel ratio occurs near the radical change from 1V to 0V.More Information
Need more information on how to fix the P0151 code?Get Access to Factory Service Manuals
Information for specific makes
- P0151 AUDI HO2S21 Sensor Circuit Low Voltage
- P0151 BMW O2 Sensor Circuit Low Voltage Bank 2 Sensor 1
- P0151 BUICK HO2S Circuit Low Voltage Bank 2 Sensor 1
- P0151 CADILLAC HO2S Circuit Low Voltage Bank 2 Sensor 1
- P0151 CHEVROLET HO2S Circuit Low Voltage Bank 2 Sensor 1
- P0151 CHRYSLER O2 sensor 2/1 Circuit Low
- P0151 DODGE O2 sensor 2/1 Circuit Low
- P0151 FORD O2 Sensor Circuit Low Voltage Bank 2 Sensor 1
- P0151 GMC HO2S Circuit Low Voltage Bank 2 Sensor 1
- P0151 HYUNDAI HO2S Circuit Low Voltage Bank 2 Sensor 1
- P0151 INFINITI-2 Air Fuel Ratio Circuit Low Bank 2 Sensor 1
- P0151 INFINITI O2 Sensor Circuit Low Bank 2 Sensor 1
- P0151 JAGUAR O2 Sensor Circuit Low Voltage Bank 2 Sensor 1
- P0151 JEEP O2 sensor 2/1 Circuit Low
- P0151 KIA HO2S21 Circuit Low Voltage
- P0151 MAZDA HO2S LF Circuit Low Input
- P0151 MERCEDES-BENZ O2 Sensor Circuit Low Voltage Bank 2 Sensor 1
- P0151 MINI O2 Sensor Circuit Low Voltage Bank 2 Sensor 1
- P0151 MITSUBISHI Cylinder 2-3 Front Heated Oxygen Sensor Circuit Low Voltage
- P0151 NISSAN-2 Air Fuel Ratio Circuit Low Bank 2 Sensor 1
- P0151 NISSAN O2 Sensor Circuit Low Bank 2 Sensor 1
- P0151 PONTIAC HO2S Circuit Low Voltage Bank 2 Sensor 1
- P0151 SATURN HO2S Circuit Low Voltage Bank 2 Sensor 1
- P0151 SUBARU HO2S21 Circuit Low Voltage
- P0151 VOLKSWAGEN HO2S21 Sensor Circuit Low Voltage