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Home >> Oldsmobile >> 2003 >> Bravada AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Self-Diagnostics - 4.2L >> Diagnostic Tests >> DTC P0420: Catalyst System Efficiency Below Threshold (Bank 1) >> Conditions For Setting DTC

Conditions For Setting DTC

The PCM determines that the oxygen storage capacity of the converter is degraded past a calibrated value.

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