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.
2004 Toyota PriusFACTORY OEM SERVICE PROCEDURE
Mass Air Flow Meter (1NZ-FXE): Replacement
- REMOVE REAR FLOOR BOARD NO.2 (See REPLACEMENT )
- REMOVE DECK FLOOR BOX REAR (See REPLACEMENT )
- REMOVE REAR FLOOR BOARD NO.3 (See REPLACEMENT )
- DISCONNECT ENGINE WIRE NO.3 (BATTERY NEGATIVE TERMINAL) (See REPLACEMENT )
- REMOVE MASS AIR FLOW METER
- Disconnect the mass air flow meter connector.
- Remove the 2 screws, then remove the mass air flow meter.
- INSTALL MASS AIR FLOW METER NOTE: Be careful that the O-ring is not cracked or jammed when installing.
- CONNECT ENGINE WIRE NO.3 (BATTERY NEGATIVE TERMINAL) (See REPLACEMENT )
- INSTALL REAR FLOOR BOARD NO.3
- INSTALL DECK FLOOR BOX REAR
- INSTALL REAR FLOOR BOARD NO.2
- POWER WINDOW CONTROL SYSTEM INITIALIZE (See INTRODUCTION )
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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