2.2.123. SPN 3220, FMI 12, Upstream NOx sensor: NOx signal not valid after heater release in an appropriate time.ΒΆ

Description

Plausibility problem of the NOx sensor signal.

Possible causes are:

  • The NOx sensor is defective.

Reaction in EEM

The FC is stored and the warning lamp is activated. The CAN message indicates an active fault.

NOTE: The present fault is classified as an emission related fault. Engine power is reduced after a certain time which is defined by an authority.

Solution

First save the error log and then do the procedure that follows:

  • Check the NOx-sensor operation with service tool NOx-sensor test.
  • Check the operation with another NOx sensor to see if the sensor is defective.

See NOx sensor for reference.