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P0154 - O2 Sensor Circuit No Activity Detected Bank 2 Sensor 1

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
What does this mean? What does this mean?
Tech notes
Replacing the Front Heated Oxygen Sensor Bank 2 usually takes care of the problem.
What does this mean? What does this mean?
When is the code detected?
The voltage from the sensor is constantly approx. 0.3V.
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- High Fuel Consumption
- Excessive Smoke from Exhaust
P0154 Description

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.

P0154 Information for specific makes
P0154 ACURA A/F Sensor 21 Heater System Malfunction
P0154 AUDI HO2S21 Sensor Circuit No Activity Detected
P0154 BUICK HO2S Circuit Insufficient Activity Bank 2 Sensor 1
P0154 CADILLAC HO2S Circuit Insufficient Activity Bank 2 Sensor 1
P0154 CHEVROLET HO2S Circuit Insufficient Activity Bank 2 Sensor 1
P0154 CHRYSLER O2 Sensor 2/1 Circuit Open
P0154 DODGE O2 Sensor 2/1 Circuit Open
P0154 FORD O2 Sensor Circuit No Activity Detected Bank 2 Sensor 1
P0154 GMC HO2S Circuit Insufficient Activity Bank 2 Sensor 1
P0154 HONDA Front Air/Fuel Ratio Sensor Bank 2 Sensor 1 Heater System Malfunction
P0154 HYUNDAI HO2S Circuit No Activity Detected Bank 2 Sensor 1
P0154 INFINITI O2 Sensor Circuit No Activity Detected Sensor 1 Bank 2
P0154 JEEP O2 Sensor 2/1 Circuit Open
P0154 KIA HO2S21 Circuit No Activity Detected
P0154 LEXUS HO2S21 No Circuit Activity Detected
P0154 MAZDA HO2S LF Circuit No Activity
P0154 MERCEDES-BENZ O2 Sensor Circuit No Activity Detected Bank 2 Sensor 1
P0154 MITSUBISHI Cylinder 2-3 Heated Oxygen (front) Sensor No Activity Detected
P0154 NISSAN O2 Sensor Circuit No Activity Detected Sensor 1 Bank 2
P0154 PONTIAC HO2S Circuit Insufficient Activity Bank 2 Sensor 1
P0154 SATURN HO2S Circuit Insufficient Activity Bank 2 Sensor 1
P0154 SCION HO2S21 No Circuit Activity Detected
P0154 SUBARU HO2S21 No Activity Detected
P0154 TOYOTA HO2S21 No Circuit Activity Detected
P0154 VOLKSWAGEN HO2S21 Sensor Circuit No Activity Detected
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