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2011
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300 C, 4WD
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Repair and Diagnosis
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Different car
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Section 1188 (5.7L - DTCS P018B To P057F - 1500)
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DTC Troubleshooting
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P0420-Catalyst Efficiency (Bank 1)
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Set Condition
Set Condition
WARNING:
This page is about a different car, the 2016 RAM 1500. However, it is still accessible from the selected car via links, so may be relevant.
the Downstream O2 Sensor State of Change (SOC) is not within the calibrated threshold