1. IAT Sensor Itself:
* Location: Find the IAT sensor. It's usually located in the intake air duct, often near the air filter housing or mass airflow sensor (MAF). Consult your repair manual for the exact location on your specific 2002 Taurus model.
* Visual Inspection: Look for any obvious physical damage to the sensor, such as cracks, broken wires, or corrosion. Pay close attention to the connector.
* Check the Connector: Inspect the connector for any loose, corroded, or damaged pins. Clean the connector with electrical contact cleaner if necessary.
* Resistance Check (Optional but Recommended): If you have a multimeter, you can check the resistance of the IAT sensor. Your repair manual will specify the correct resistance range at a given temperature. This is the most definitive way to determine if the sensor is faulty. Be careful when checking this, as you need to ensure proper readings based on the ambient temperature. Incorrect readings could point to the sensor being at fault even if it isn't.
* Replacement: If the sensor is damaged, corroded, or shows out-of-range resistance, replace it. These sensors are relatively inexpensive.
2. Wiring and Connector:
* Wiring Harness: Carefully inspect the wiring harness leading to the IAT sensor for any breaks, chafing, or shorts. Look for areas where the wiring might be rubbing against metal parts.
* Connector Pins: Make sure all pins are securely seated in both the sensor and the harness connector. A loose connection can cause intermittent problems.
3. Other Potential Issues (Less Likely but Possible):
* PCM Issues: While less common, a faulty PCM can also cause a P0113 code. This is usually diagnosed after the IAT sensor and wiring have been checked and ruled out. PCM replacement is expensive and should be considered a last resort.
* MAF Sensor: A malfunctioning Mass Airflow Sensor (MAF) can sometimes indirectly affect the IAT sensor readings. Check the MAF sensor as well if the IAT sensor replacement doesn't resolve the issue. Cleaning the MAF sensor can sometimes resolve minor issues.
Before you start:
* Clear the Code: After performing any repairs, disconnect your battery's negative terminal for a few minutes to clear the trouble code from the PCM's memory. Then, start the car and see if the code returns.
* Repair Manual: A repair manual specific to your 2002 Ford Taurus is highly recommended. It will provide detailed diagrams, specifications, and troubleshooting steps.
Important Note: If you're not comfortable working on your car's electrical system, it's best to take it to a qualified mechanic. Improperly diagnosing or repairing electrical issues can lead to further damage.
