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

Tech notes

Replacing the Front Heated Oxygen Sensor Bank 2 usually takes care of the problem.

When is the code detected?

The voltage from the sensor is constantly approx. 0.3V.

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 INFINITI
P0154 NISSAN
P0154 HONDA
P0154 BUICK
P0154 ACURA
P0154 CHRYSLER
P0154 JEEP
P0154 DODGE
P0154 HYUNDAI
P0154 KIA
P0154 LEXUS
P0154 TOYOTA
P0154 SCION
P0154 MAZDA
P0154 MITSUBISHI
P0154 SUBARU
P0154 AUDI
P0154 VOLKSWAGEN
P0154 CADILLAC
P0154 CHEVROLET
P0154 GMC
P0154 PONTIAC
P0154 SATURN