This procedure covers the removal and replacement of the Mass Air Flow (MAF) sensor on a 2019-2024 Toyota RAV4 with the 2.5L I4 gasoline engine.

Warnings

Tools required

Parts

• Mass Air Flow (MAF) Sensor × 1 — Toyota 22204-0H010 or equivalent

Preparation

1. Park vehicle on level ground and apply parking brake
2. Turn ignition off and remove key
3. Allow engine to cool to ambient temperature
4. Open and secure hood

Procedure

1. 1

   Locate the MAF sensor
   Open the hood and locate the MAF sensor mounted in the air intake tube between the air filter box and the throttle body. The sensor is positioned approximately 6-8 inches downstream from the air filter housing on the driver's side of the engine bay.
2. 2

   Disconnect the electrical connector
   Press down on the locking tab on the MAF sensor electrical connector and carefully pull the connector straight away from the sensor. Do not pull on the wires themselves. Note the orientation of the connector for reinstallation.
3. 3

   Loosen the downstream intake clamp
   Using a Phillips screwdriver or 10mm socket, loosen the hose clamp securing the intake tube to the downstream side of the MAF sensor housing. You do not need to remove the clamp completely, just loosen it enough to allow the tube to separate.
   Torque spec

   Air Intake Clamps3 Nm (2 lb-ft)
4. 4

   Remove MAF sensor mounting screws
   Remove the two Phillips-head screws securing the MAF sensor to the air intake tube. These screws are located on opposite sides of the sensor housing. Keep these screws in a safe location as they will be reused during installation.
   Torque spec

   MAF Sensor Screws3 Nm (2 lb-ft)
5. 5

   Extract the MAF sensor
   Carefully pull the MAF sensor straight out of the intake tube. The sensor may require slight wiggling to break the seal with the rubber grommet. Avoid touching the sensing element (visible hot wire or film element) inside the sensor body.
6. 6

   Inspect and clean intake tube
   Inspect the intake tube opening and rubber seal for debris, oil contamination, or damage. Wipe clean with a lint-free cloth if necessary. Check for cracks in the intake tube that could cause unmetered air to enter the system.
7. 7

   Install new MAF sensor
   Insert the new MAF sensor into the air intake tube, ensuring the arrow or flow direction marking on the sensor body points toward the engine (downstream). Align the screw holes carefully and press the sensor fully into the rubber grommet until it seats completely.
8. 8

   Install and torque mounting screws
   Install the two MAF sensor mounting screws and tighten them to 3.0 Nm (2.0 lb-ft). Alternate between screws and tighten gradually to ensure even seating. These screws are small and can be easily overtightened, so use caution.
   ⚠Do not overtighten the MAF sensor screws. The plastic housing can crack if excessive force is applied.
   Torque spec

   MAF Sensor Screws3 Nm (2 lb-ft)
9. 9

   Secure the intake tube clamp
   Ensure the intake tube is fully seated on the downstream side of the MAF sensor housing, then tighten the hose clamp to 3.0 Nm (2.0 lb-ft). Verify the tube is not twisted or kinked.
   Torque spec

   Air Intake Clamps3 Nm (2 lb-ft)
10. 10

    Reconnect electrical connector
    Push the electrical connector firmly onto the MAF sensor until you hear or feel a distinct click, indicating the locking tab has engaged. Gently tug on the connector to verify it is securely locked in place.

Reassembly

1. Double-check that all hose clamps are properly tightened and the intake system is secure
2. Verify the electrical connector is fully engaged with the locking tab in place
3. Ensure no tools or parts have been left in the engine bay

Verification

• Start the engine and listen for any abnormal hissing or whistling sounds that would indicate an air leak at the MAF sensor
• Check that the engine idles smoothly without rough running or stalling
• Verify that the Check Engine light illuminates during key-on and extinguishes after engine start (may remain on temporarily until ECU relearns)
• Take a short test drive to confirm normal throttle response and acceleration
• If a scan tool is available, verify that MAF sensor readings are within normal range (typically 2-7 grams/second at idle, increasing with throttle application)

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