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Home › Pontiac › 2003 › Vibe Base, AWD › Repair and Diagnosis › Engine Performance › System › Engine Control System - Self-Diagnostics › Diagnostic Tests › DTC P0420: Catalyst System Low Efficiency › Conditions For Running DTC

Conditions For Running DTC

  1. Engine coolant temperature is more than 158°F (70°C).
  2. Engine speed is 2500-3000 RPM for at least 3 minutes while driving at certain vehicle speeds.
  3. Engine is operating in Closed Loop.
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