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 signal from the sensor is lower than the specified time.

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)
– High Fuel Consumption
– Excessive smoke from Exhaust

P0151 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.

P0151 Information for specific makes

P0151 JAGUAR
P0151 BMW
P0151 NISSAN-2
P0151 NISSAN
P0151 INFINITI-2
P0151 BUICK
P0151 INFINITI
P0151 CHRYSLER
P0151 JEEP
P0151 DODGE
P0151 HYUNDAI
P0151 KIA
P0151 MAZDA
P0151 MITSUBISHI
P0151 SUBARU
P0151 VOLKSWAGEN
P0151 AUDI
P0151 CADILLAC
P0151 CHEVROLET
P0151 GMC
P0151 PONTIAC
P0151 SATURN
P0151 FORD