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2021
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Challenger SRT Hellcat, Automatic Trans
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Repair and Diagnosis
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Engine Performance
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System
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6.2L - DTCS P2246 To U0121
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DTC Troubleshooting
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P2256-O2 Sensor 2/1 Negative Current Control Circuit High
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Set Condition
Set Condition
The Powertrain Control Module (PCM) detects a short to battery voltage on the O2 2/1 Return circuit or the O2 2/1 Signal circuit.