Reducing Agent, Automatic Regeneration

WARNING: This page is about a different car, the 2015 Audi A7 Quattro and 2014 Audi A7 Quattro. However, it is still accessible from the selected car via links, so may be relevant.

The reducing agent flows back into the reducing agent tank via the metering line to the Reducing Agent Injector -N474- after switching off the ignition.
Before working in this area, wait 10 minutes after switching off the ignition so that the recirculation can complete.
Likewise, wait 10 minutes after switching off the ignition before disconnecting the battery so that the recirculation process can complete, refer to BATTERY, DISCONNECTING AND CONNECTING .

WARNING:

Danger due to reducing agent leaking out.

To prevent large amounts of reducing agent from leaking out when opening the metering line, wait for the recirculation process of the reducing agent to complete.