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Chevrolet
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2006
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Optra LS, Standard
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Repair and Diagnosis (Single Page)
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Engine Performance
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System
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Engine Controls - 1.4L DOHC
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Diagnostic Information and Procedures
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DTC P0420
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Conditions for Setting the DTC
Conditions for Setting the DTC
The ECM determines that the efficiency of the catalyst has degraded below a calibrated threshold.