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Home › Infiniti › 2004 › M45 › Repair and Diagnosis › Engine Performance › Engine Control System › DTC P0171, P0174: Fuel Injection System Function › Diagnostic Procedure › 2. Check For Intake Air Leak

2. Check For Intake Air Leak

  1. Listen for an intake air leak after the mass air flow sensor.
  2. Check PCV hose connection.

OK or NG 

  1. OK: GO TO 3.
  2. NG: Repair or replace.
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