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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Self-Diagnostics - 4.3L >> Diagnostic Tests >> DTC P0420 Or P0430: TWC System - Low Efficiency (Bank 1 & 2) >> Conditions For Setting DTC

Conditions For Setting DTC

The PCM determines the oxygen storage capability of the catalytic converter has degraded below a calibrated threshold.

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