This procedure covers the removal and replacement of the Mass Air Flow (MAF) sensor on a 2014-2019 Toyota Corolla with the 1.8L I4 engine.

Warnings

Tools required

Parts

• Mass Air Flow Sensor × 1 — 22204-0H010 or equivalent

Preparation

1. Park vehicle on level surface and engage parking brake
2. Turn ignition off and remove key
3. Allow engine to cool if recently operated
4. Open hood and secure with prop rod

Procedure

1. 1

   Locate the MAF sensor
   The MAF sensor is located in the air intake tube between the air filter housing and the throttle body, approximately 6 inches downstream from the air filter box on the driver's side of the engine bay. It is a black cylindrical component with an electrical connector on top.
2. 2

   Disconnect the electrical connector
   Press down on the locking tab of the electrical connector on top of the MAF sensor and pull the connector straight up and away from the sensor. Do not pull on the wires themselves.
3. 3

   Loosen the intake tube clamp (upstream)
   Using a Phillips screwdriver or 10mm socket, loosen the hose clamp on the air filter housing side of the MAF sensor. You do not need to completely remove the clamp, just loosen it enough to allow the tube to slide free.
   Torque spec

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

   Loosen the intake tube clamp (downstream)
   Loosen the hose clamp on the throttle body side of the MAF sensor using the same method. Again, loosening is sufficient; complete removal is not necessary.
   Torque spec

   Air Intake Clamps3 Nm (2 lb-ft)
5. 5

   Remove the MAF sensor assembly
   Gently twist and pull the MAF sensor with attached intake tube section out of both hose connections. The sensor is integrated into a short section of intake tubing on this model. Set the assembly on a clean work surface with the sensor opening facing up to prevent debris entry.
6. 6

   Inspect and clean (optional)
   If reusing the old sensor for diagnostic purposes, inspect the sensing elements visible inside the sensor housing. Look for oil contamination, debris, or damage. If cleaning, use only approved MAF sensor cleaner spray and never touch the internal elements. Allow to air dry completely for at least 10 minutes before reinstallation.
7. 7

   Install the new MAF sensor assembly
   Position the new MAF sensor assembly (or cleaned original) between the two intake tube connections. Ensure the arrow marking on the sensor body points toward the throttle body (direction of airflow). Push firmly into both hose connections until fully seated.
8. 8

   Tighten the intake clamps
   Tighten both hose clamps to specification. Start with the upstream clamp (air filter side), then tighten the downstream clamp (throttle body side). Ensure the clamps are positioned over the raised bead on each hose connection for proper sealing.
   Torque spec

   Air Intake Clamps3 Nm (2 lb-ft)
9. 9

   Reconnect the electrical connector
   Push the electrical connector firmly onto the MAF sensor until you hear and feel a distinct click indicating the locking tab has engaged. Gently tug on the connector to verify it is secure.

Reassembly

1. Ensure all hose clamps are properly tightened and positioned
2. Verify the electrical connector is fully locked in place
3. Check that no tools or debris have been left in the engine bay

Verification

• Start the engine and verify it idles smoothly without stalling or rough running
• Check for intake air leaks by listening for hissing sounds around the MAF sensor connections
• Take a short test drive and confirm normal acceleration response and no check engine light
• If available, use an OBD-II scanner to verify MAF sensor readings are within normal range (typically 2-7 grams/second at idle when warm)

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