Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

2009 Toyota Yaris S, 4D HatchbackFACTORY OEM SERVICE PROCEDURE

Mass Air Flow Meter: Removal

DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL
REMOVE MASS AIR FLOW METER
1. Disconnect the wire harness clamp and mass air flow meter connector.
  
  Fig 1: Locating Wire Harness Clamp And Mass Air Flow Meter Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Remove the 2 screws and the mass air flow meter.
  
  Fig 2: Locating Mass Air Flow Meter And Screws
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Remove the O-ring from the mass air flow meter.
  
  Fig 3: Identifying Mass Air Flow Meter And O-ring
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.

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