SCR System Safety Precautions
WARNING: This page is about a different car, the 2016 Audi A7 Quattro. However, it is still accessible from the selected car via links, so may be relevant.
Note the Following when Working on the Selective Catalytic Reduction (SCR)-System
WARNING:
The reducing agent can cause skin irritation.
- Avoid contact with skin and eyes! Wear protective gloves!
- If reducing agent should get on your skin, wash it off immediately with soap and water.
- If reducing agent gets in your eye, rinse the eye for several minutes with water.
- Never inhale or swallow the reducing agent!
- Should you swallow any reducing agent, rinse your mouth, drink plenty of water and contact a doctor immediately.
Note the Following when Removing or Installing Any Components of the SCR-System
- The reducing agent tank must be empty when working on the SCR-System. Be sure to read the work procedure whenever the reducing agent in the tank must be emptied. Empty the tank, if necessary; procedure. Refer to REDUCING AGENT TANK, DRAINING .
Note the Following when Removing or Installing the Tank:
- The reducing agent tank must be empty. Drain the fuel tank: procedure. Refer to REDUCING AGENT TANK, DRAINING .
Reducing Agent, Automatic Regeneration
- The reducing agent flows back into the tank via the metering line to the Reducing Agent Injector -N474- when the ignition is turned off.
- 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 to complete.