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2022
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Compass Red
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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 P0303 To P0506
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DTC Troubleshooting
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P0420-Catalyst System Efficiency Below Threshold Bank 1
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Set Condition
Set Condition
The Powertrain Control Module (PCM) detects a failed catalyst if the final test ratio is greater than 0.65.