Reducing Agent, Automatic Recirculation

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After switching off the ignition, the reducing agent flows back into the reducing agent tank via the metering line to the Reducing Agent Injector -N474-.
Before working in this area, wait at least 10 minutes after switching off the ignition so that the recirculation process can be completed.
Also wait 10 minutes after switching off the ignition before disconnecting the battery so that the recirculation process can be completed. Refer to BATTERY, DISCONNECTING AND CONNECTING .

Risk of damage due to reducing agent

If any reducing agent contacts the trim or body components, the reducing agent can crystallize after a period of time and damage the surface.

-- Make sure the reducing agent does not contact any trim or vehicle body components.

-- If any contact occurs on surfaces, remove the reducing agent immediately using water and a towel.