Your Guide to Cleaning a Dirty Mass Air Flow Sensor

Follow these steps to get your sensor sparkling and your engine running smoothly

Co-authored by Devin McSween Reviewed by Jason Shackelford

Last Updated: December 11, 2024 Fact Checked

If your car hesitates when you accelerate or your check engine light refuses to turn off, a dirty mass air flow sensor might be the culprit. You might think that a hefty cleaning session is in store, but it’s a super quick and simple job. In this article, we’ll provide all the steps you need to clean this small but mighty car part and keep your engine running smoothly. Read on to get cleaning!

Things You Should Know

Locate the mass air flow (MAF) sensor under your car’s hood. It’s usually between the air filter box and throttle body on the driver’s side.
Unplug the connector from the sensor. Then, unscrew it and take it out of your car.
Spray the wire or plate inside the sensor with 10-15 sprays of MAF cleaner .
Let the sensor dry for 1 hour before putting it back in your car.

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1

Turn your car off to let it cool down.

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Because the sensor is connected to wires, your car needs to be off when you go to remove it. Just park it in your driveway and turn it off. Then, leave your car for about 10 minutes so the engine is nice and cool. ^{[1]
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2

Put on gloves and safety glasses.

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To further protect yourself as you clean, wear safety glasses and gloves. When you work in your car, always wear protective gear. Gloves and safety glasses protect your skin and eyes from oil, chemicals, and debris as you clean the sensor. ^{[2]
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3

Find your mass airflow (MAF) sensor.

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Pop the hood and look for the sensor by the air box and throttle body. Open your car’s hood and look towards the driver’s side. You’ll see a large black box connecting to a silver part; this is the air filter box and throttle body. Right in between these parts is the MAF sensor, which is usually a small black square attached to a thick connector. ^{[3]
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- Some cars house the MAF sensor inside the air filter box, so open it up and move the box aside to find the MAF sensor.
- Every car’s MAF sensor placement is slightly different. If you’re still unsure where your sensor is located, check your car’s manual. Or, search online for “a mass air flow sensor” with your car’s make and model.

4

Disconnect the MAF sensor from the connector.

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Find the large, black connector that’s plugged into the MAF sensor. Most connectors have a squeezable head that loosens it from the sensor. Then, pull on the connector while wiggling it back and forth to remove it from the sensor. ^{[4]
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5

Remove the MAF sensor.

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Take a Phillips-head screwdriver and remove each screw securing the MAF sensor to your car. Be sure to put the screws in a safe location so you don’t lose them. Then, take out the sensor and place it on a table covered with a towel. ^{[5]
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6

Clean the inside of the MAF sensor with MAF cleaner.

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Spray the MAF sensor’s hot wire or plate with MAF cleaner . Depending on your car, your sensor will either have a tiny silver wire resting inside a hole or have a silver plate extending from it. Insert the straw into the MAF cleaner. Then, hold it about 4 inches (10 cm) away from your MAF sensor. Spray about 10 to 15 spurts of the cleaner onto the wire or plate. ^{[6]
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- Do not use anything besides MAF cleaner to clean your sensor. This cleaner is specifically designed to clean its delicate wire or plate. Using brushes, cloths, other car part cleaners, or rubbing alcohol can damage the sensor. ^{[7]
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- If the wire or plate still has gunk covering it or doesn’t look bright and shiny, spray it with cleaner until it’s sparkling.

7

Leave your MAF sensor to dry for 1 hour.

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Let the MAF cleaner evaporate before reinstalling the sensor. It’s important not to put a wet MAF sensor back in your car, as this can damage the electronic connector. MAF cleaner usually dries pretty quickly, but to be on the safe side, let it be for 1 hour. ^{[8]
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- It might be tempting, but don’t dry your MAF sensor off with a cloth. The sensor is super delicate and wiping it can damage its parts.

8

Install the cleaned MAF sensor back in your car.

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Screw the MAF sensor back in place and plug in the connector. Using a Phillips-head screwdriver and the screws you removed, secure the MAF sensor into your car. Then, attach the connector to the sensor. Your MAF sensor is now sparkling clean, which your car will thank you for! ^{[9]
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- If you have a car stalling issue or a lit check engine light, cleaning the MAF sensor can often solve the issue.
- If these problems persist, your sensor might just be old or faulty. To replace it, search for the MAF sensor that’s compatible with your car or check your car’s manual. Unplug the connector, take out the sensor, and pop in your new one. ^{[10]
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9

Clean the MAF sensor every 6 months.

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To extend the life of your MAF sensor and prevent costly repairs, clean it semi-regularly. Because the MAF sensor is stored near your air filter box, that makes it a great time to clean it when you change your air filter , or about every 6 months. ^{[11]
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Warnings

Do not brush, scrub, or wipe the MAF sensor. This sensor is very delicate, so rubbing it can easily damage its parts.

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Always wear protective gear like safety glasses and gloves when working on your car.

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Only use mass airflow (MAF) cleaner to clean your MAF sensor. Other cleaners can leave a harmful residue that damages the sensor.

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Your Guide to Cleaning a Dirty Mass Air Flow Sensor

Things You Should Know

Steps

Get Car Support Solve Any Problem

Turn your car off to let it cool down.

Put on gloves and safety glasses.

Find your mass airflow (MAF) sensor.

Disconnect the MAF sensor from the connector.

Remove the MAF sensor.

Clean the inside of the MAF sensor with MAF cleaner.

Leave your MAF sensor to dry for 1 hour.

Install the cleaned MAF sensor back in your car.

Clean the MAF sensor every 6 months.

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