Fault code: EMS 4164 SCANIA

Error identification:

The temperature in the tank is lower than is reasonable.

Cause:

Fault on the tank temperature sensor or the tank heating system.

The water valve for the heating system may be stuck open.

Notes:

The fault affects the vehicle s emissions of nitrogen oxides (NOx) and the lamp which warns about a high level of contaminants comes on in the instrument cluster. A text message is also displayed in vehicles with NOx monitoring.

Vehicles with NOx monitoring

An active fault code limits the maximum engine torque by approximately 40%.

An active fault code cannot be cleared from the control unit. When the fault has been rectified, the control unit must verify that the fault has been rectified in order for the fault code to become inactive.

Action:

Check the tank temperature sensor and electrical cables.

Check whether the heating water valve is stuck in the closed position.

Proceed as follows to verify that the fault has been rectified:

The temperature of the reductant in the tank must be above - 8°C.

Switch off the power with the starter key, wait for at least 90 seconds and switch on the power with the starter key again.

If the fault is resolved, the fault code becomes inactive. Clear the fault code.

Switch the power off and on with the starter key three times in succession at 10 second intervals to turn off the warning lamp.