Ford Aerostar Intake Air Temperature Sensor Guide (1986-1997)
Is a faulty intake temperature sensor causing poor performance in your Ford Aerostar? Here’s what you need to know.
- A bad IAT sensor is a common cause of a Check Engine Light, poor gas mileage, and rough running in a 1986-1997 Aerostar.
- This is a very simple and inexpensive DIY repair that most owners can complete in under 15 minutes.
- For this part, a quality aftermarket brand like Standard Ignition offers reliable performance at a much lower cost than OEM.
- Common trouble codes associated with this failure are P0112 (circuit low) and P0113 (circuit high).
Is Your Aerostar Running Rough? It Could Be the IAT Sensor
If your 1986-1997 Ford Aerostar is experiencing issues like poor fuel economy, a rough idle, or has the Check Engine Light on, a bad Intake Air Temperature (IAT) sensor could be the culprit. This small sensor plays a big role in how your engine performs. When it fails, the engine's computer gets incorrect information, leading to the wrong air-fuel mixture. This can cause a range of noticeable problems.
Symptoms of a Failing IAT Sensor
A bad IAT sensor can make your van hard to live with. Here are the most common signs of failure:
- Check Engine Light: This is often the first sign. The computer will store a trouble code like P0112 or P0113.
- Poor Fuel Economy: If the sensor tells the computer the air is colder than it is, the engine will use too much fuel.
- Rough Idle or Stalling: An incorrect air-fuel mixture can make your engine run unevenly, especially when stopped or during warm-up.
- Hard Starting: The engine may struggle to start, particularly in cold weather, because the fuel mixture isn't right for the conditions.
- Sluggish Performance: You might notice your Aerostar hesitates or feels weak when you accelerate.
- Failed Emissions Test: An improper fuel mixture can increase harmful emissions like NOx, causing you to fail an emissions inspection.
Choosing the Right Aftermarket Sensor
For a vehicle like the 1986-1997 Aerostar, you don't need to buy an expensive OEM part from the dealer. A quality aftermarket sensor will work just as well and save you money. However, not all aftermarket brands are the same.
| Brand Tier | Available Brands | Quality & Value Assessment |
|---|---|---|
| Good Quality Aftermarket | Standard Ignition (SMP) | Standard Ignition is a well-known brand that produces reliable, direct-fit replacement parts. They are known for good quality control and are a trusted choice for sensors like the IAT. This is a solid, dependable option. |
| Standard/Value Tier | True Tech | Information on "True Tech" as a parts manufacturer is limited; search results primarily show repair shops with this name. This suggests it may be a private-label or store brand. While it may offer cost savings, its manufacturing reputation is not as established as brands like Standard Ignition. |
Pro Tip: Given the low cost of this part, opting for a trusted name brand like Standard Ignition is a smart investment for peace of mind and reliable performance.
Cost of Replacing the IAT Sensor
This is an inexpensive and easy repair, making it a great DIY project.
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket Part | $15 - $22 |
| New OEM Part | $30 - $50 |
| Shop Labor | $50 - $75 |
Frequently Asked Questions
Where is the IAT sensor located on my Ford Aerostar?
The Intake Air Temperature sensor on the Ford Aerostar is typically a standalone sensor screwed directly into the engine's intake manifold or the air intake ducting before the throttle body. It has a two-wire electrical connector.
Can I replace this sensor myself?
Yes, this is a very easy job for a DIY mechanic. The replacement involves unplugging the electrical connector, unscrewing the old sensor with a wrench, and screwing the new one in. The entire process usually takes less than 15 minutes.
What happens if I don't replace a bad IAT sensor?
You can still drive the vehicle, but you will continue to experience symptoms like poor fuel economy, rough running, and bad performance. Over time, running with a very rich or lean fuel mixture is not ideal for the engine and can lead to other issues like carbon buildup. It will also prevent you from passing an emissions test.
Are there any recalls for the Aerostar IAT sensor?
While the Ford Aerostar has had many recalls over its lifespan, none of them specifically target the Intake Air Temperature sensor.
Technical Specifications
OEM Part Numbers: 9C1Z-12A697-B E1AZ12A697A
2-pin, screw-in thermistor sensor.
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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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