Volvo All Engines (2010 Emissions) Fault Code: SPN 3226 FMI 20 PID: PSID 90 Aftertreatment Outlet NOx

The NOx sensor measures the amount of NOx in the exhaust system. The NOx sensor is connected in the J1939-2 data link. This diagnostic trouble code (DTC) indicates a NOx monitoring failure. For example; NOx sensor short- or open circuit, NOx sensor removed, NOx sensor missing signal.

Observable symptoms
1) None

Probable cause
1) Sensor not mounted in exhaust stream
2) Faulty sensor

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