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2018
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Durango SRT
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Repair and Diagnosis
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Engine Performance
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System
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6.4L - DTCS P0201 To P0533
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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 looks at the Downstream O2 Sensor SOC in blocks. Each block is approximately 15.0 to 20.0 seconds. If the Downstream O2 Sensor SOC is not within the calibrated threshold, a fault is set.