Possible causes

– Faulty Mass Airflow Sensor (MAF)
– Mass Airflow Sensor harness is open or shorted
– Mass Airflow Sensor circuit poor electrical connection

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)

P1103 Information for specific makes

P1103 ACURA
P1103 HYUNDAI
P1103 KIA
P1103 HONDA
P1103 AUDI
P1103 VOLKSWAGEN
P1103 MAZDA
P1103 MITSUBISHI
P1103 SUBARU