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Infiniti
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2004
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Q45
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Repair and Diagnosis (Single Page)
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Engine Performance
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Engine Control System
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DTC P0420, P0430: Three Way Catalyst Function
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Diagnostic Procedure
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1. Check Exhaust System
1. Check Exhaust System
Visually check exhaust tubes and muffler for dent.
OK or NG
OK : GO TO 2.
NG : Repair or replace.