How to Clean a MAF Sensor on a Corolla

Updated February 21, 2017

The mass airflow sensor is a critical component within the Toyota Corolla. The sensor, commonly called the MAF sensor, tells the engine's computer how much air is going into the engine. The engine computer uses this information to maintain and control the air to fuel ratio. Regular MAF sensor maintenance includes cleaning the sensor when the Corolla begins to idle roughly or consume more gas. Keeping the sensor clean will help the Toyota run efficiently.

Place the Corolla in "Park" and allow the vehicle to cool for a half hour, permitting components to cool completely.

Locate the MAF sensor under the hood of the Corolla. The sensor is found on the air intake side of the engine and is positioned directly behind the air box. Refer to the Corolla owner's manual for a diagram, if needed.

Unhook the wiring harness on the sensor and place it to the side. Use a T-20 Torx bit to remove the two screws holding the sensor down. Unhook the hose clamps that secure the sensor in place. The sensor will now be loose enough to remove.

Remove the sensor by carefully pulling it off of the mount. The sensor may need to be jostled a bit to remove it, but be careful to not damage the component.

Spray MAF housing cleaner into and on top of the sensor. Be sure to get cleaner into the plug area and screen as well. Clean away dirt and debris on the sensor using a microfiber cloth.

Reinstall the sensor by placing it back onto the engine intake. Replace the screws and tighten using the T-20 Torx. Attach the hose clamps and reconnect the wiring harness. Close the Corolla's bonnet.

Things You'll Need

  • T-20 Torx bit
  • MAF housing cleaner
  • Microfiber cloth
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About the Author

Johnathan Cronk is a freelance writer and began writing at the age of 18. Throughout his career he has specialized in sports, how-to and advice articles. He has also written sales pitches in the corporate setting since 2001. He studied business at Hudson Valley Community College before transferring to the State University of New York, Albany.