Operation CHARM
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Saturn
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1996
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SL L4-1.9L SOHC VIN 8
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Repair and Diagnosis
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Powertrain Management
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Computers and Control Systems
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Testing and Inspection
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Component Tests and General Diagnostics
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System Diagnosis - Catalyst Monitor System
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Catalyst Converter Efficiency Below Threshold
Catalyst Converter Efficiency Below Threshold
For component testing, use P0420 trouble code diagnosis.
P0420