Possible causes

– Faulty mass air flow sensor
– Intake air leaks
– Dirty mass air flow sensor
– Dirty mass air filter
– Mass air flow sensor harness is open or shorted
– Mass air flow sensor circuit poor electrical connection

Tech notes

Before replacing the mass air flow sensor, try replacing the air filter and cleaning the air flow sensor with low compress air or mass air flow sensor cleaner. Reset code and drive vehicle. If the code comes back, it may be necessary to replaced the mass air flow sensor.

When is the code detected?

An excessively high voltage from the sensor is sent to Engine Control Module (ECM).

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)
– Engine stall
– Engine running rough
– Excessive fuel consumption
– Excessive smoke

P0103 Description

The Mass Air Flow (MAF) sensor is placed in the stream of intake air. It measures the intake flow rate by measuring a part of the entire intake flow. It consists of a hot film that is supplied with electric current from the Engine Control Module (ECM).
The temperature of the hot film is controlled by the ECM a certain amount. The heat generated by the hot film is reduced as the intake air flows around it. The more air, the greater the heat loss. Therefore, the ECM must supply more electric current to maintain the temperature of the hot film as air flow increases. The ECM detects the air flow by means of this current change.

P0103 Information for specific makes

P0103 GMC
P0103 CHEVROLET
P0103 CADILLAC
P0103 BUICK
P0103 VOLKSWAGEN
P0103 CHRYSLER
P0103 DODGE
P0103 SATURN
P0103 JEEP
P0103 FORD
P0103 HONDA
P0103 ACURA
P0103 HYUNDAI
P0103 INFINITI
P0103 NISSAN
P0103 ISUZU
P0103 KIA
P0103 PONTIAC
P0103 LEXUS
P0103 TOYOTA
P0103 MAZDA
P0103 MITSUBISHI
P0103 SUBARU
P0103 AUDI
P0103 JAGUAR
P0103 HUMMER
P0103 MERCEDES-BENZ
P0103 LAND-ROVER