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Home >> Nissan-Datsun >> 2004 >> Sentra SE-R >> Repair and Diagnosis >> External Pages >> Different car >> Section 412 (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

WARNING: This page is about a different car, the 2004 Infiniti M45. However, it is still accessible from the selected car via links, so may be relevant.
  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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