Possible causes
– Faulty Intake Air Temperature (IAT) Sensor
– Intake Air Temperature (IAT) Sensor harness is open or shorted
– Intake Air Temperature (IAT) Sensor circuit poor electrical connection
– Intake Air Temperature (IAT) Sensor harness is open or shorted
– Intake Air Temperature (IAT) Sensor circuit poor electrical connection
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P1109 FORD Description
Intake Air Temperature (IAT)