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Home >> Infiniti >> 2004 >> M45 >> Repair and Diagnosis >> Engine Performance >> Engine Control System >> DTC P0420, P0430: Three Way Catalyst Function >> Diagnostic Procedure >> 2. Check Exhaust Gas Leak
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

2. Check Exhaust Gas Leak

  1. Start engine and run it at idle.
  2. Listen for an exhaust gas leak before the three way catalyst (Manifold).
Fig 1: Checking For Exhaust Leaks
G00796009Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG 

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