Conditions for Running the DTC

WARNING: This page is about a different variant/trim than selected.

Ambient Air Temperature = -7 to 42°C (19 to 108°F)
BARO Sensor = Greater than 70 kPa (10.2 PSI)
Calculated Catalyst Temperature = Colder than 55°C (131°F)
Coolant Temperature = Colder than 55°C (131°F)
Engine - Running

DTC P0421 runs when the above conditions are met for greater than 150 s