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Dodge and Ram
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2020
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ProMaster 3500 Van Cargo Extended
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Repair and Diagnosis
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Engine Performance
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System
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3.6L - DTCS P0344 To P0571
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DTC Troubleshooting
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P0420-Catalyst System Efficiency Below Threshold Bank 1
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Set Condition
Set Condition
The Powertrain Control Module (PCM) detects a failed catalyst if the final Downstream O2 Sensor state of change test ratio is greater than the calibrated fail threshold.