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P0073 Ford Code - Ambient Air Temperature Sensor Circuit 'A' High

Quick Answer

The P0073 diagnostic trouble code (DTC) for Ford vehicles indicates a problem with the Ambient Air Temperature Sensor Circuit 'A' being too high. Common causes include Faulty Ambient Air Temperature Sensor: The sensor itself may be malfunctioning, providing incorrect temperature readings to the ECM, Wiring Issues: Damaged or corroded wiring connections to the sensor can lead to high voltage signals being sent to the ECM, Sensor Placement: If the sensor is placed too close to the engine or exhaust components, it may pick up higher temperatures than actual ambient air. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P0073 Ford indicates Ambient Air Temperature Sensor Circuit 'A' High.
Common causes
Common causes include Faulty Ambient Air Temperature Sensor: The sensor itself may be malfunctioning, providing incorrect temperature readings to the ECM, Wiring Issues: Damaged or corroded wiring connections to the sensor can lead to high voltage signals being sent to the ECM, Sensor Placement: If the sensor is placed too close to the engine or exhaust components, it may pick up higher temperatures than actual ambient air.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Aug 18, 2024
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Code P0073 Ford Description

The P0073 diagnostic trouble code (DTC) for Ford vehicles indicates a problem with the Ambient Air Temperature Sensor Circuit 'A' being too high. The ambient air temperature sensor is responsible for measuring the temperature of the air outside the vehicle, which is crucial for various systems such as the engine control module (ECM) to adjust fuel and ignition timing. When the sensor circuit detects a high voltage, it means that the temperature reading is higher than expected, leading to potential issues with engine performance, emissions, and overall vehicle operation.

OBDII Code P0073 Ford - Ambient Air Temperature Sensor Circuit 'A' High
P0073 Ford Code - Ambient Air Temperature Sensor Circuit 'A' High

Common Causes of P0073 Ford

  1. Faulty Ambient Air Temperature Sensor: The sensor itself may be malfunctioning, providing incorrect temperature readings to the ECM.
  2. Wiring Issues: Damaged or corroded wiring connections to the sensor can lead to high voltage signals being sent to the ECM.
  3. Sensor Placement: If the sensor is placed too close to the engine or exhaust components, it may pick up higher temperatures than actual ambient air.
  4. ECM Malfunction: A problem with the engine control module can also cause erroneous high voltage readings from the ambient air temperature sensor.

Symptoms of P0073 Ford

  1. Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the dashboard.
  2. Incorrect Temperature Readings: The vehicle's temperature display may show inaccurate readings or remain at a constant high temperature.
  3. Poor Fuel Efficiency: A faulty ambient air temperature sensor can result in poor fuel efficiency due to incorrect air temperature readings.
  4. Engine Performance Issues: The engine may experience hesitation, rough idling, or stalling as a result of incorrect air temperature data affecting fuel and ignition timing.

How to Fix P0073 Ford

  1. Diagnostic Testing: Use a scan tool to read the code and perform diagnostic testing to confirm the issue with the ambient air temperature sensor.
  2. Sensor Replacement: Replace the ambient air temperature sensor with a new one that meets the manufacturer's specifications.
  3. Check Wiring: Inspect the wiring harness for any damage or corrosion, repairing or replacing any faulty connections.
  4. Sensor Placement Adjustment: Ensure that the ambient air temperature sensor is correctly positioned away from heat sources to provide accurate readings.
  5. ECM Testing: If necessary, test the engine control module to ensure it is functioning correctly and not causing the high voltage readings.

Cost to Fix P0073 Ford

The cost of repairing a P0073 code for a Ford vehicle can vary depending on the specific model, location, and labor rates of the auto repair shop. On average, the parts for an ambient air temperature sensor replacement can range from $50 to $100, with labor costs adding another $80 to $150 per hour. Overall, the total repair cost for addressing this issue may fall in the range of $150 to $300, but it's advisable to obtain a detailed quote from a qualified mechanic based on your vehicle's needs.

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Information for Specific Ford Models

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0073 Ford Code

1. What are common symptoms of OBDII code P0073 in a Ford vehicle?

- Common symptoms include inaccurate ambient air temperature readings on the dashboard, poor fuel efficiency, and potential issues with the climate control system.

2. What is the likely cause of OBDII code P0073 in a Ford?

- The most common cause of code P0073 is a malfunctioning ambient air temperature sensor or a problem with the sensor circuit 'A', leading to high voltage readings.

3. How can I diagnose the issue related to OBDII code P0073 in my Ford?

- To diagnose the problem, you can use a multimeter to test the ambient air temperature sensor's resistance and voltage readings, as well as check the wiring and connector for any damage.

4. Can I drive my Ford with the OBDII code P0073 present?

- It is generally safe to drive your Ford with code P0073, but it is recommended to address the issue promptly to prevent potential fuel efficiency problems and inaccurate temperature readings.

5. What are some repair tips for fixing OBDII code P0073 in a Ford?

- Repair tips include replacing the ambient air temperature sensor, checking and repairing any damaged wiring or connectors, and clearing the fault codes with an OBDII scanner.

6. Will resetting the OBDII code P0073 in my Ford make the issue go away?

- Resetting the code may temporarily clear the warning light, but if the underlying problem with the ambient air temperature sensor or circuit 'A' is not fixed, the code is likely to reappear.

7. Are there any common mistakes to avoid when dealing with OBDII code P0073 in a Ford?

- One common mistake is overlooking simple issues like a loose connector or damaged wiring when troubleshooting the code. Ensure thorough inspection before replacing components.

8. How much does it typically cost to repair OBDII code P0073 in a Ford?

- The cost of repairing code P0073 in a Ford can vary depending on the exact cause of the issue, but it may range from $100 to $300 for parts and labor.

9. Can extreme weather conditions affect the ambient air temperature sensor and trigger OBDII code P0073 in a Ford?

- Yes, extreme temperatures can sometimes affect the ambient air temperature sensor's performance, leading to false high voltage readings and triggering code P0073.

10. Is it possible to prevent OBDII code P0073 from occurring in my Ford?

- While some causes of code P0073 may be unavoidable, regular maintenance checks, keeping the sensor clean, and promptly addressing any issues can help prevent this code from occurring.

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