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Volvo engine code DTC P0420
NOx Catalyst: Reductant Delivery Emission Threshold A faulty DEF delivery system operation will impact the NOx emissions and subsequently a low DEF efficiency will be detected. The fault separation from conversion efficiency is achieved by using an aftermarket/service routine. P0420 NOx Catalyst: Reductant Delivery Performance DTC P0420 Component / System NOx Catalyst - Reductant Delivery Performance Monitor Strategy Description Low NOx conversion efficiency Fault Limit Calculated NOx conversion efficiency DOC temperature rate of change < 66% Enable Conditions • Engine Speed 1400 - 1800 RPM • Exhaust Mass Flow > 0.33 kg/s • System Out NOx Flow > 0.05 g/s • Inlet SCR Temperature 250 - 500 °C • Average SCR Temperature 250 - 500 °C • Outlet SCR Temperature 250 - 500 °C • Ambient Air Temperature -8 - 55 °C • Barometric Pressure 75 - 105 kPa • Coolant Temperature > 65 °C Disable Conditions No Active DTC's: • P2201, P229F, P242B, P0421, P0402, P0401, P225C, P225E Time Required For DTC To Be Set 30 seconds MIL Illumination 2 Drive Cycles