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Home >> Dodge and Ram >> 2003 >> Durango Base, 5.9 Z, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 103 (Powertrain Diagnostic Procedures) >> Diagnostic Information And Procedures >> DRIVEABILITY - NGC - Diagnostic Tests >> P0420-Catalyst 1/1 Efficiency, P0430-Catalyst 2/1 Efficiency >> Possible Causes

Possible Causes

WARNING: This page is about a different car, the 2004 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.
  1. GOOD TRIP EQUAL TO ZERO
  2. VISUALLY INSPECT CATALYTIC CONVERTER
  3. EXHAUST LEAK
  4. ENGINE MECHANICAL CONDITION
  5. AGING O2 SENSOR
  6. CATALYTIC CONVERTER
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