How to Replace a Mass Airflow Sensor

A mass airflow sensor, or MAF for short, is found almost exclusively on fuel injected engines. A MAF is an electronic device that runs between your vehicle’s airbox and intake manifold. It measures the amount of air that passes through it, and sends this information to the engine’s computer, or ECU. The ECU takes this information and combines it with air intake temperature data to help determine the proper amount of fuel necessary for an optimal combustion. If your vehicle’s MAF sensor is failing, you will notice rough idling and the vehicle running rich.

Part 1 of 1: Replacing the bad MAF sensor

Materials Needed

MAF sensor with electrical connector

Step 1: Disconnect the electrical connector from the mass air flow sensor. Squeeze the tab on the harness side of the electrical connector while firmly pulling on the connector.

Keep in mind, the older the vehicle, the more stubborn these connectors can be.

Remember, do not pull on the wires, only the connector itself. It helps to use gloves with a rubberized coating if your hands are slipping off the connector.

MAF sensor disconnected

Step 2: Disconnect the mass air flow sensor. Use a screwdriver to loosen the clamp or screws on each side of the MAF that secure it to the intake pipe and air filter. Once the clamps are removed, you should be able to pull the MAF right out.

  • Tip: There are many different ways a MAF sensor is secured. Some have screws that hold it to an adapter plate which attaches directly to the airbox. Some have clamps that hold the sensor in-line of the intake pipe. When you obtain your replacement MAF sensor, note the type of connections it uses and make sure to have the appropriate tools to disconnect and reconnect the sensor to the airbox and intake pipe.

maf sensor reconnected

Step 3: Connect the new mass airflow sensor. The sensor slides into the intake and then is clamped on.

On the airbox side, it may reconnect with bolts or it may be the same as the intake side, depending on your particular vehicle.

Make sure all the clamps and screws are snug, but do not overtighten them as the sensor is plastic and can break if handled too roughly.

  • Warning: Use extra care to not touch the element of the sensor on the inside of the MAF. The element will be exposed when the sensor is removed and it is very delicate.

Step 4: Reconnect the electrical connector. Reconnect the electrical connector to the new mass airflow sensor by sliding the female side of the connector over the male side that is attached to the sensor. Press firmly until you hear a click that indicates the connector is seated all the way and locked into position.

At this point, double check all your work to make sure you haven’t left anything loose and the job is complete.

If this job seems like more than you are willing to attempt, a qualified technician from YourMechanic can come to your home or office to replace the mass airflow sensor for you.


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Recent Mass Airflow Sensor Replacement reviews

Excellent Rating

(238)

Rating Summary
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4
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7
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7

Matthew

33 years of experience
1052 reviews
Matthew
33 years of experience
Hyundai Tucson L4-2.0L - Mass Airflow Sensor - Hampton, Virginia
Matt is amazing. His workmanship is unquestinable, on time, gets teh job done right the first time. Love working with him.
BMW 525i - Mass Airflow Sensor Replacement - Newport News, Virginia
I was taken aback that there are still mechanics like Matt who exemplified great customer service and displays a passion for what he does. Matt was on time,very friendly, professional and informative. I will highly recommend Matt to my friends and colleagues, Thank you again Matt you made this unpleasant experience for me very pleasant.

Breck

20 years of experience
681 reviews
Breck
20 years of experience
Mazda 3 L4-2.0L - Mass Airflow Sensor - Houston, Texas
This is my third appointment with Breck. He showed up over 30 minutes early and performed the scheduled service, replacing a sensor on my car and cleaning my engine. He test drove my car to make sure the issue was fixed and answered any questions I had. I will continue to book Breck for future service appointments whenever I can.
Mazda 3 - Mass Airflow Sensor - Houston, Texas
Breck was able to replace a worn belt on my vehicle, and drove out to find another sensor needed for the repairs during the service appointment when he discovered he was sent the incorrect item for my car. I will continue to book Breck for future service appointments.

Dan

39 years of experience
888 reviews
Dan
39 years of experience
Nissan Murano V6-3.5L - Mass Airflow Sensor - Lawrenceville, Georgia
Dan performed an outstanding job on my 2012 Murano, very knowledgeable, professional and courteous and I would recommend your service/ business anytime

Rusty

23 years of experience
456 reviews
Rusty
23 years of experience
GMC Sierra 1500 V8-4.8L - Mass Airflow Sensor - Arlington, Texas
Outstanding and honest! Rusty is quick, on time, communicative, and an expert in his field. I don't know what we would do without his help. He has done multiple jobs on multiple vehicles and is our mechanic of choice!

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