Mike's Workshop Manuals
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2021
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ProMaster City Base
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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 P0632
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DTC Troubleshooting
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P050B-Cold Start Ignition Timing Performance
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Set Condition
Set Condition
The Powertrain Control Module (PCM) detects that the average Catalyst efficiency is below the calibrated failure threshold.