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Home › Infiniti › 2004 › M45 › Repair and Diagnosis (Single Page) › Engine Performance › Engine Control System › DTC P0420, P0430: Three Way Catalyst Function › Diagnostic Procedure › 3. Check Intake Air Leak

3. Check Intake Air Leak

Listen for an intake air leak after the mass air flow sensor.

OK or NG 

  1. OK: GO TO 4.
  2. NG: Repair or replace.
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