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Home >> Dodge and Ram >> 2003 >> Durango Base, 5.9 Z, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 15 (Engine Controls - Self Diagnostics - 4.7L) >> Diagnostic Tests >> DTC P0420: Catalyst 1/1 Efficiency, DTC P0421: Warm Up Catalyst 1/1 Efficiency Below Threshold Or DTC P0432: Warm Up Catalytic 2/1 Efficiency Below Threshold >> Possible Causes

Possible Causes

WARNING: This page is about a different car, the 2003 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.