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Home >> Dodge and Ram >> 2020 >> Durango R/T, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 32 (3.6L - DTCS P0365 To P0441) >> P0420-Catalyst System Efficiency Below Threshold Bank 1 >> Possible Causes

Possible Causes

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Possible Causes
Exhaust Leak
Engine Mechanical Condition
Aging Or Fouled Upstream O2 Sensor
Catalytic Converter

Always Perform The Pre-Diagnostic Troubleshooting Procedure Before Proceeding. Refer To  PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE  . 

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