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Chevrolet
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2002
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Prizm Base, Standard
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Repair and Diagnosis
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Engine Performance
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System
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Engine Controls - Self-Diagnostics - 1.8L
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Diagnostic Tests
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DTC P0420: Catalyst System Low Efficiency
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Conditions For Running DTC
Conditions For Running DTC
ECT is greater than 158°F (70°C).
Engine speed is 2500-3000 RPM for at least 3 minutes while driving at certain speeds.
Engine is operating in closed-loop.