Possible causes

– Faulty Front Heated Oxygen Sensor Bank 1
– Front Heated Oxygen Sensor Bank 1 harness is open or shorted
– Front Heated Oxygen Sensor Bank 1 circuit poor electrical connection
– Inappropriate fuel pressure
– Faulty fuel injectors
– Intake air leaks may be faulty
– Exhaust gas leaks

Tech notes

Replacing the O2 Sensor 1 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

P0131 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.

P0131 Information for specific makes

P0131 BMW
P0131 SUZUKI
P0131 CHRYSLER
P0131 JEEP
P0131 DODGE
P0131 JAGUAR
P0131 HYUNDAI
P0131 NISSAN-2
P0131 NISSAN
P0131 INFINITI-2
P0131 INFINITI
P0131 ISUZU
P0131 KIA
P0131 MAZDA
P0131 MITSUBISHI
P0131 SUBARU
P0131 VOLKSWAGEN
P0131 BUICK
P0131 AUDI
P0131 CADILLAC
P0131 CHEVROLET
P0131 GMC
P0131 PONTIAC
P0131 SATURN
P0131 FORD