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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

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  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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