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Chrysler
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2018
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Pacifica Limited, Gas/Ethanol
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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 P1E28 To U0101
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DTC Troubleshooting
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P2271-O2 Sensor 1/2 Signal Biased Rich
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Set Condition
Set Condition
The PCM detects that the Downstream O2 Sensor does not transition from a rich to lean condition within a specific time during a DFSO event.