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Home >> Chrysler >> 2003 >> Intrepid ES, 3.5 V >> Repair and Diagnosis >> External Pages >> Different car >> Section 5 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0420: Catalytic 1/1 Efficiency Or DTC P0432: Catalytic 2/1 Efficiency >> Monitored & Set Conditions

Monitored & Set Conditions

WARNING: This page is about a different car, the 2002 Dodge Intrepid, 2002 Chrysler Intrepid, 2002 Chrysler Concorde, and 2002 Chrysler 300M. However, it is still accessible from the selected car via links, so may be relevant.

Catalytic converter efficiency is monitored after engine warms up to 158°F (70°C), vehicle speed 20-55 MPH AND with engine speed at 1216-1952 RPM. DTC will set if catalyst efficiency deteriorates, the switch rate of the downstream O2 sensor approaches that of the upstream O2 sensor. If at any point during the test the switch ratio reaches a predetermined value a counter is incremented by one.

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