Toyota
Highlander Mass Airflow Sensor Replacement Guide
How to change a faulty MAF (mass air
flow) sensor in a 3rd generation 2014 to 2018 Toyota Highlander SUV.
 2017 Highlander 3.5L V6 Engine |
 Engine Air Filter Box |
 Air Intake Hose |
| This
automotive maintenance tutorial was specifically written to assist
owners of the third generation (2014, 2015, 2016, 2017, 2018 and
probably also the 2019 and 2020 model years) Toyota Highlander SUV
in cleaning or changing a faulty MAF (mass airflow) sensor attached to the air
intake hose near the engine air filter box. Owners of other Toyota, Lexus and Scion vehicles such as the 4Runner, Avalon, 86, C-HR, Camry, Corolla, iM, Land Cruiser, Mirai, Prius, RAV4, Sequoia, Sienna, Tacoma, Tundra, Yaris, FR-S, xB, xD, tC, xA, CT 200h, ES 250, ES 300, ES 330, ES 350, IS 250, IS 350, RX 300, GS 250, NX 300 and RX 350. The genuine OEM Toyota / Lexus mass airflow sensor part number is 22204-75040 (also known as # 2220475040 or 22204 75040). The only tool needed to remove and replace the MAF sensor is a standard Phillips head screwdriver. If you would like to try cleaning the old sensor before buying an new one use some Mass Air Flow Cleaner Spray. |
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 Push In Release Button |
 Slide Off Power Plug |
 Loosen Counterclockwise |
| The first two steps
are to open the hood and then move to the right rear corner of the engine
bay closest to the driver's seat. Locate the engine air filter box, the air intake tube and the black plastic MAF sensor that sits on top of the hose. Loosen the two screws by turning them in the counterclockwise direction with the Phillips head screwdriver. |
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 Remove Second Screw |
 Two Screws Removed |
 Pull Out Old MAF Sensor |
| Set the two screws
aside in a safe place. Carefully pull the old MAF sensor straight out of the port in the air intake tube. If you have trouble removing the old sensor, try gently rotating it back and forth or wiggling it while pulling it straight out. |
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 Old Sensor Removed |
 Part # 22204-75040 |
 Sensor Housing In Intake |
| Before you purchase
a new sensor, you should try cleaning the old one with some
Mass Air Flow Cleaner Spray. If you have an OBD II Scan Tool, some of the MAF sensor related error codes that you might see include P0101, P0102 and P0103. After you clean the old sensor and clear the DTC (diagnostic trouble codes) with the OBD 2 scanner, re-install the sensor and test it by starting the engine. |
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 Install New Sensor |
 Tighten Screws Clockwise |
 Replace Second Screw |
| If you decide to
replace the old MAF sensor, the compatible replacement part number is
Toyota
22204-75040. Lower the new sensor down into the opening in the air intake tube. Line up the two screw holes in the sensor with their corresponding holes in the air intake assembly. Tighten the two screws by turning them in the clockwise direction until they are snug. Try to avoid over tightening the screws to prevent from cracking the plastic sensor housing. |
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 New Sensor Installed |
 Push On Electrical Connector |
 MAF Sensor Replaced |
| Push the electrical
connector straight on to the socket on the new sensor. The plug should "click" securely into place. Be sure to record the MAF sensor cleaning or replacement in your vehicle's service records. Please check out all of my
2014-2018 Toyota Highlander DIY Repair & Maintenance Guides. |
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