Selective Catalytic Reduction (SCR) System Safety Precautions
WARNING: This page is about a different car, the 2015 Audi Q7, 2014 Audi Q7, and 2013 Audi Q7. However, it is still accessible from the selected car via links, so may be relevant.
Observe the Following when Working on the Reducing Agent Metering 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 Reducing Agent Metering System:
- The reducing agent active/passive tanks must be empty when working on the reducing agent metering system. Be sure to read the work procedure whenever the reducing agent in the active or passive tank must be emptied. Drain the active tank or the passive tank, if necessary. For information on the active tank. Refer to REDUCING AGENT ACTIVE TANK, DRAINING and for the passive tank, refer to REDUCING AGENT PASSIVE TANK, DRAINING .
Note the Following when Removing and Installing the Active or Passive Tank:
- The reducing agent active/passive tank must be empty. Drain the active or passive tank, if necessary. For information on the active tank. Refer to REDUCING AGENT ACTIVE TANK, DRAINING and for the passive tank, refer to REDUCING AGENT PASSIVE TANK, DRAINING .
Reducing Agent, Automatic Regeneration
- The reducing agent flows back into the active 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 be completed. Refer to Reducing Agent, Automatic Regeneration, above.