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Volvo engine code DTC P221A
NOx Sensor #2: NOx Sensor Measurement Monitor This OBD monitor consists of a NOx Sensor Measurement value comparison between the two NOx sensors. The fault condition is reached whenever the absolute difference between the NOx Sensor Measurement values exceeds the threshold. P221A NOx Sensors: NOx Sensor Measurement Rationality Monitor DTC P221A Component / System NOx Sensors - NOx Sensor Measurement Monitor Strategy Description Plausibility Fault Limit Absolute dference between Lambda IN and Lambda OUT greater than threshold evaluated 30 times > 1 Enable Conditions • Engine Speed 1300-1900 RPM • Engine Torque > 1000 Nm • Ambient Air Temperature -7 - 40 °C • Barometric Pressure 75 - 105 kPa • Coolant Temperature > 65 °C • Engine Speed Stability -10 - 10 RPM • Torque Stability -15 - 15 Nm Disable Conditions No Active DTC's: • P0400, P0402, P225D, P225F, P242A, P0421, P2201, P225C, P221A Time Required For DTC To Be Set 0.6 seconds (30 sub evaluations. If 30 out of 30 evaluations are good => PASS, If 1 or more out of 30 evaluations is fail => FAIL) MIL Illumination 2 Drive Cycles