Fault code: 4180 SCANIA

Error identification:

The temperature of the reductant in the tank has been above the permitted level.

Cause:

There may be a fault in the tank temperature sensor or the water valve in the heating system is stuck open.

This fault code can also be generated if it is very warm outside.

Notes:

The fault causes reductant injection to be switched off.

High temperatures can damage the reductant.

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.

Check whether the water valve is stuck in the open position.

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

• The temperature of the reductant in the tank should be below 59°C.

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

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.