Does Your 1991 Subaru 2.2 Engine Have a MAF Sensor?

If you are a proud owner of a 1991 Subaru equipped with a 2.2L engine, you may be wondering if your car has a Mass Air Flow (MAF) sensor. The MAF sensor plays an essential role in the engine’s performance, so it’s important to understand whether or not your car has one. In this article, we’ll explore what a MAF sensor is, how it works, and which models of the 1991 Subaru have a MAF sensor.

What is a MAF Sensor?

A MAF sensor is a device that measures the amount of air entering the engine. It works by calculating the air’s mass flow rate, which tells the engine control unit (ECU) how much fuel to inject into the engine. This determines the engine’s performance, fuel efficiency, and emissions.

How Does it Work?

The MAF sensor is usually located between the air filter and the throttle body or carburetor. It measures the density and temperature of the incoming air using either a hot-wire or a heated film element. The sensor then sends a voltage signal to the ECU, which calculates the air’s mass flow rate and adjusts the fuel injection accordingly.

Which Models of the 1991 Subaru Have a MAF Sensor?

The 1991 Subaru Legacy and the Subaru Impreza with a 2.2L engine are equipped with a MAF sensor. However, the Subaru Loyale with a 2.2L engine does not have a MAF sensor.

Common Issues and Troubleshooting

Like any part in a car’s engine, the MAF sensor can experience problems that affect the engine’s performance. Some common issues include contamination, damage to the hot-wire or film element, or electrical problems.

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If the MAF sensor is contaminated, it may cause the engine to run rich or lean and affect its performance. Likewise, if there is damage to the hot-wire or film element, the sensor may not function correctly. Electrical problems such as disconnected or damaged wiring can also cause issues with the MAF sensor’s performance.

If you suspect that your MAF sensor is causing issues with your engine’s performance, you should bring your car to a mechanic to diagnose the problem. They may recommend cleaning or replacing the MAF sensor to restore your car’s performance.

Maintaining Your MAF Sensor

Regular maintenance of your MAF sensor can help prolong its lifespan and keep your engine running smoothly. It’s recommended that you clean your sensor every 12,000-15,000 miles or as needed. You can clean the sensor by using a cleaning solution specific for MAF sensors or with rubbing alcohol and a soft-bristled brush. Be sure to follow the manufacturer’s instructions and precautions when cleaning your sensor.


In summary, the 1991 Subaru Legacy and Impreza with a 2.2L engine are equipped with a MAF sensor, while the Subaru Loyale with a 2.2L engine does not have one. The MAF sensor plays a crucial role in determining the engine’s performance, fuel efficiency, and emissions. Regular maintenance of the MAF sensor can help prevent performance issues and prolong its lifespan. If you suspect a problem with your MAF sensor, bring your car to a mechanic for a diagnosis and repair. Happy driving!


Q: What happens if my MAF sensor fails?

A: If your MAF sensor fails or malfunctions, it can cause a variety of engine performance issues such as poor fuel economy, hesitation when accelerating, rough idle, or stalling.

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Q: Can I drive my car without a MAF sensor?

A: If your car is equipped with an ECU that relies on a MAF sensor for fuel injection, driving without a functional MAF sensor can cause significant problems with the engine’s performance, fuel economy, and emissions. In some cases, driving without a MAF sensor can also cause damage to the engine.

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Joseph Weaver

With a background in engineering and a passion for cars, Joseph brings a unique perspective to our blog. He's particularly interested in the technology and innovation behind Subaru's advanced safety features, and his articles on this topic are always insightful and informative. When he's not writing, he enjoys playing video games and spending time with his family.

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