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Home >> Chevrolet >> 1999 >> Tracker 4D Utility, RWD, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Diagnostic Tests >> DTC P0420: Three-Way Catalyst (TWC) System Low Efficiency >> Condition For Running DTC

Condition For Running DTC

Barometric pressure equal to or greater than 75 kPa, engine coolant temperature 18-230°F (-8-110°C), intake air temperature is greater than 18°F (-8°C), fuel tank level is greater than 15 percent, and engine is operating in closed loop.

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