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Chevrolet
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2002
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Camaro Base, 2D Convertible, Standard
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Repair and Diagnosis
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Engine Performance
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System
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Engine Control System Self-Diagnostics - 3.8L
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Diagnostic Tests
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DTC P0420: TWC System - Low Efficiency
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Conditions For Setting DTC
Conditions For Setting DTC
The PCM determines that the catalyst's oxygen storage capacity is less than an acceptable threshold.