Ford Taurus Engine Intake Manifold Temperature Sensor Guide (1991-2000)
Learn about common failure symptoms and how to choose the right replacement intake air temperature sensor for your Taurus.
- A bad IAT sensor on a Taurus most commonly causes a Check Engine Light, poor gas mileage, and rough idling.
- Replacement is a simple, beginner-friendly DIY task that usually takes less than 30 minutes.
- For this part and vehicle age, both standard (Standard Ignition) and value (True Tech) aftermarket brands are suitable choices.
- No specific recalls for the IAT sensor exist for this Taurus generation, but checking your VIN for other recalls is always a good practice.
Understanding the Intake Air Temperature Sensor
The intake air temperature (IAT) sensor in your 1991-2000 Ford Taurus is a simple but critical component for engine management. It's a type of thermistor, which means its electrical resistance changes with temperature. The engine's computer reads this change in resistance as a voltage signal to determine how hot or cold the intake air is. This allows the computer to make continuous, precise adjustments to the fuel injectors and ignition system, ensuring the engine runs efficiently under all conditions. On many Ford vehicles, the IAT sensor can be a standalone part screwed into the intake manifold or air duct, or it can be integrated into the Mass Airflow (MAF) sensor housing.
Symptoms of a Failing IAT Sensor
When the IAT sensor starts to fail, it sends incorrect information to the engine computer, which can lead to a variety of noticeable problems. Recognizing these signs early can help you avoid further issues.
🎬 Watch this video to see common symptoms of sensor failure.- Check Engine Light: This is often the first and most common sign. The computer will log a fault code, such as P0112 (circuit low) or P0113 (circuit high), when it detects a signal outside the expected range.
- Poor Fuel Economy: An incorrect temperature reading can cause the computer to enrich the fuel mixture unnecessarily, leading to more trips to the gas station.
- Rough Idle and Stalling: The engine may idle erratically or stall because the air-fuel mixture isn't correct for the current conditions.
- Hard Starting: Especially in cold weather, a bad sensor can prevent the computer from providing the richer fuel mixture needed to start the engine easily.
- Sluggish Acceleration and Misfires: Incorrect timing and fuel delivery can result in hesitation, a general lack of power, and engine misfires.
Known Issues & Recalls
Searches on the National Highway Traffic Safety Administration (NHTSA) database did not reveal any specific recalls or widespread technical service bulletins (TSBs) directly related to the intake air temperature sensor for the 1991-2000 Ford Taurus. However, recalls for other issues on these model years exist, so it's always wise for owners to check their specific vehicle's VIN on the NHTSA website.
Choosing the Right Aftermarket Sensor
For a vehicle like the 1991-2000 Taurus, aftermarket sensors provide a cost-effective solution. OEM parts may be difficult to find or unnecessarily expensive. Aftermarket brands like Standard Ignition and True Tech offer reliable replacements.
- Standard Ignition (Standard Motor Products): A well-established brand in the aftermarket industry, often considered a higher-tier replacement part. They are known for producing sensors that meet or exceed original specifications and undergo factory testing.
- True Tech: Generally positioned as a value-oriented brand. While they offer a more budget-friendly option, they are suitable for this application, providing reliable function for daily driving needs.
Pro Tip: For critical engine sensors, choosing a brand with a good reputation like Standard Ignition can provide extra peace of mind. However, given the simplicity of the IAT sensor and the ease of replacement, a value brand is also a perfectly acceptable choice for most owners.
| Brand Tier | Estimated Price |
|---|---|
| Value (e.g., True Tech) | $15 - $25 |
| Standard (e.g., Standard Ignition) | $25 - $45 |
Frequently Asked Questions (FAQ)
Where is the IAT sensor located on my 1991-2000 Ford Taurus?
The IAT sensor is typically located in the air intake system. You can usually find it screwed into the plastic intake air tube (between the air filter box and the throttle body) or sometimes directly in the intake manifold itself. It will have a two-wire electrical connector.
🎬 See exactly where to find the IAT sensor on Ford vehicles.Is this the same as the coolant temperature sensor?
No. While they may function similarly, the IAT sensor measures air temperature, and the coolant temperature sensor (CTS) measures the temperature of the engine's coolant. Both are critical, but they provide different information to the engine computer.
How difficult is it to replace the IAT sensor?
This is one of the easier DIY jobs. It typically involves disconnecting the battery, unplugging the electrical connector, and unscrewing the old sensor. The new one is then screwed in and reconnected. The entire process usually takes less than 30 minutes.
What happens if I don't replace a bad IAT sensor?
While your car will likely still run, you will continue to experience symptoms like poor fuel economy, rough running, and increased emissions. Over time, running with a consistently incorrect air-fuel ratio could potentially lead to other issues, such as carbon buildup or damage to the catalytic converter.
🎬 Learn more about how a bad sensor affects your engine.Helpful Videos
Technical Specifications
OEM Part Numbers: F1SZ-12A697-A F5AF-12A697-AA F5AZ-12A697-A
Connector: 2-pin, round. Mount type: Screw-in.
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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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