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.

2007 Lexus RX 350 FWDFACTORY OEM SERVICE PROCEDURE

On-Vehicle Inspection

INSPECT MASS AIR FLOW METER
NOTE:
- Perform the MAF meter inspection by following the procedures below.
- Only replace the MAF meter when both the LONG FT#1 value and MAF value in the DATA LIST (with the engine stopped) are not within the normal operating range.
1. Perform confirmation driving pattern.
  1. Connect the intelligent tester to the DLC3.
  2. Turn the ignition switch to the ON position.
  3. Turn the tester on.
  4. Clear the DTCs (See DTC CHECK/CLEAR ).
  5. Start the engine and warm it up with all accessory switches off (until the engine coolant temperature is 75°C (167°F) or more).
  6. Drive the vehicle at 31 mph (50 km/h) or more for 3 minutes or more (*1).
  7. Let the engine idle (accelerator pedal fulley released) for 2 minutes or more (*2).
  8. Perform steps (*1) and (*2) at least 3 times or more.
    
    Fig 1: Connecting Intelligent Tester To DLC3
    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.