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Nissan-Datsun
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2004
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Maxima SL, RE5F22A
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Repair and Diagnosis
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Engine Performance
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System
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Engine Control System - DTC
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DTC P0420, P0430: Three Way Catalyst Function
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Diagnostic Procedure
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2. Check Exhaust Gas Leak
2. Check Exhaust Gas Leak
Start engine and run it at idle.
Listen for an exhaust gas leak before the three way catalyst (manifold).
Fig 1: Check Exhaust Gas Leak
Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
OK: GO TO 3.
NG: Repair or replace.