Ford Explorer Ambient Air Temperature Sensor Guide (2012-2023)
Is your Explorer's A/C acting up or the dash temperature totally wrong? Your ambient air temp sensor is the likely culprit.
- A bad Ambient Air Temperature Sensor is a very common cause for A/C failure in 2012-2023 Ford Explorers.
- Symptoms include an incorrect outside temperature on the dash (like -40°F) and the A/C not blowing cold.
- Replacement is very easy and DIY-friendly, often taking less than 15 minutes and requiring no special tools.
- A quality aftermarket brand like Standard Ignition or Dorman is a perfectly acceptable and cost-effective choice for this repair.
Is Your Ford Explorer's A/C Not Working? Check This Sensor First.
If you own a 2012 to 2023 Ford Explorer and the air conditioning suddenly stops blowing cold, don't assume the worst. A very common and inexpensive part is often to blame: the Ambient Air Temperature (AAT) sensor. When this sensor fails, it can trick your vehicle into thinking it's freezing outside, which prevents the A/C compressor from engaging. This article will walk you through the symptoms, how to choose the right aftermarket replacement, and answer common questions about this simple but crucial sensor.
Where is the Sensor Located?
On most 2012-2019 Ford Explorers, the ambient air temperature sensor is located behind the front grille. You can typically spot it mounted to the radiator support, often on the lower driver's side. Because of its location, it is vulnerable to damage from front-end impacts or debris. For many owners, it's possible to reach the sensor by carefully pushing on the grille or going from underneath, making replacement a quick job that doesn't require removing the whole bumper.
Pro Tip: Before ordering, visually inspect your sensor's location. On some models, you can replace it in under 10 minutes by reaching through the grille, saving you a trip to the mechanic.
Choosing the Right Aftermarket Sensor
When replacing your AAT sensor, you have several options. Since this is a simple electronic sensor and not a critical mechanical component, a quality aftermarket part is often a cost-effective choice. Here’s a breakdown of common brands:
- Motorcraft: This is Ford's own brand, the Original Equipment (OE) part. It guarantees perfect fit and function, but usually comes at the highest price. It's the benchmark for quality.
- Standard Ignition (SMP): Often considered a top-tier aftermarket brand. Standard parts are known for their quality and reliability, closely matching OE performance without the OE price tag.
- Dorman: A popular budget-friendly option that produces a huge range of aftermarket parts. For a simple sensor like this, Dorman is a viable choice for a cost-conscious repair, though some mechanics note quality can vary on more complex components.
- URO Parts: This is typically a budget or economy-tier brand. While the price is attractive, forum discussions from mechanics and DIYers often report mixed to poor quality and premature failures on various parts. It might be best to consider this brand only if other options are unavailable.
| Tier | Brands | General Assessment |
|---|---|---|
| OE / Premium Aftermarket | Motorcraft, Standard Ignition | Highest quality and reliability. Choose for peace of mind. |
| Standard Aftermarket | Dorman | Good value. A reliable choice for this specific, non-critical part. |
| Economy Aftermarket | URO Parts | Lowest cost. May have questionable long-term reliability based on general brand reputation. |
Frequently Asked Questions
What does the P0073 code mean on my Ford Explorer?
The diagnostic trouble code (DTC) P0073 stands for "Ambient Air Temperature Sensor Circuit High". This code is logged by your vehicle's computer when it detects a problem with the sensor or its wiring, often indicating an open circuit. This is a very common code associated with a failed AAT sensor.
Can I still drive my Explorer with a bad ambient temp sensor?
Yes. A bad ambient air temperature sensor will not prevent you from driving your vehicle. The primary issue you will face is a lack of comfort, as your automatic climate control and A/C may not function correctly.
Is replacing the ambient air temperature sensor a difficult job?
No, this is considered a very easy repair for most DIYers. The sensor is usually held in by a simple clip and has a single electrical connector. On many Explorers, it can be accessed through the front grille without removing any major components. The entire job can often be completed in 5-15 minutes.
Why does my dashboard say it's -40 degrees outside?
An extremely low and incorrect temperature reading (like -40°F or a similar negative number) is the most common symptom of a failed ambient air temperature sensor. The sensor has failed in a way that sends a nonsensical signal to the car's computer, which then displays that incorrect value.
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Technical Specifications
OEM Part Numbers: AU5Z-12A647-B AE5Z-12A647-A DY-1390
Typically a 2-pin thermistor sensor that clips into the radiator support or front grille assembly.
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
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