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Fiat
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2018
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500X Lounge, 4WD
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Repair and Diagnosis
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Engine Performance
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System
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2.4L - DTCS P2251 To U1504
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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 Powertrain Control Module (PCM) detects that the downstream O2 Sensor does not transition from rich to lean.