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Volvo engine code DTC P20EE
Oxides of Nitrogen (NOX) Converting Catalyst: Conversion Efficiency Emission Threshold This OBD monitor is designed to determine the DEF efficiency as calculated by using the inputs of the commanded DEF and the two NOx sensors located upstream and downstream of the NOx Catalyst. The DEF efficiency evaluation is calculated as an average value over an accumulated exhaust NOx value. A fault condition is logged if the DEF average efficiency is less than the threshold fault limit. P20EE NOx Catalyst: Conversion Efficiency DTC P20EE Component / System NOx Catalyst - Conversion Efficiency 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