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Jeep
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2021
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Grand Cherokee Laredo X, AWD, Automatic T/Case Control
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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 P2138 To U0155
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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.