Engine-Codes - Ford - P0127 2003 FORD F150

P0127 2003 FORD F150 Code - Intake Air Temperature Too High

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3
Table of contents

|P0127 2003 FORD F150 code possible causes

  • Faulty Intake Air Temperature (IAT) sensor
  • Intake Air Temperature (IAT) sensor harness is open or shorted
  • Intake Air Temperature (IAT) sensor electrical circuit poor connection

|How is the P0127 2003 FORD F150 code repair?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

|P0127 2003 FORD F150 code tech notes

If the Intake Air Temperature (IAT) is part of the Mass Air Flow (MAF) the MAF assembly will need to be replaced to fix the problem.
Indicates that IAT2 sensor has detected a potential abnormality in the intercooler system. This condition will cause the boost from the supercharger to be bypassed to avoid potential engine damage.

|What is the cost to diagnose the P0127 2003 FORD F150 code

Labor: 1.0

The cost to diagnose the P0127 2003 FORD F150 code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|What are P0127 2003 FORD F150 code possible symptoms?

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

|What is P0127 2003 FORD F150 code meaning?

The Intake Air Temperature (IAT) sensor is variable temperature sensitive resistor that measures the temperature of the air in the intake system. Sensor resistance will change based on air temperature. The higher the temperature is, the lower the resistance. The Engine Control Module (ECM) provides a reference voltage and monitors the voltage drop between a fixed value internal resistance and the sensor resistance. This is called a voltage divider circuit.
IAT sensor values are used by the ECM processor to assist with the calculation of idle speed, fuel mixture and spark advance.
Inaccurate voltages from the IAT sensor may affect pulse-width, idle quality, and tail pipe emissions. Intermittent signals may cause hesitation, stumble and surging. If an IAT sensor failure accompanies an Engine Coolant Temperature (ECT) sensor failure, cooling fan operation may also be affected.
Some manufacturers incorporate the Intake Air Temperature (IAT) sensor as part of the Mass Air Flow (MAF) sensor (Air Flow Meter).

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