P221A Fault Code

P221A NOx Sensors: NOx Sensor Measurement Rationality Monitor

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 P221A 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 30evaluations is fail => FAIL)

MIL Illumination

2 Drive Cycles

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Don't forget ! When a fault code pops up, Volvo's Uptime Center is automatically notified via an cellular link, and it alerts the truck's owner by prearranged methods, usually email or phone calls.