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Home >> Infiniti >> 2004 >> Q45 >> Repair and Diagnosis >> Engine Performance >> Engine Control System >> DTC P0171, P0174: Fuel Injection System Function >> Diagnostic Procedure >> 2. Check For Intake Air Leak
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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 

OK: GO TO 3.

NG: Repair or replace.

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