Reducing Agent Active Tank, Draining

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.

Special tools and workshop equipment required

Engine Bung SetVAS6122
Drip tray

Procedure

Follow all safety precautions. Refer to SELECTIVE CATALYTIC REDUCTION (SCR) SYSTEM SAFETY PRECAUTIONS .

Follow the guidelines for clean working conditions. Refer to FUEL SUPPLY, INJECTION SYSTEM AND CHARGING SYSTEM CLEAN WORKING CONDITIONS .

-- On a vehicle with air suspension, activate vehicle lift mode. Refer to VEHICLE LIFT MODE .

-- Remove the right rear wheel housing liner. Refer to Wheel Housing Liners .

NOTE:

Place a clean cloth under the separating location to catch any reducing agent that may leak out.

Seal off all open lines and connections with clean plugs.

Fig 1: Identifying Return Line -1-, Extension Hose -2-

Courtesy of AUDI OF AMERICA, LLC

WARNING:

The reducing agent can cause skin irritation.

Avoid contact with skin and eyes! Always wear protective gloves and safety glasses.
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.

-- Disconnect the return line -1- on the heating reservoir by pressing the release clasp. Refer to Figure.

-- Attach an extension hose -2- to the heating reservoir connection -arrow- and drain the reducing agent into the container.

-- Open the fuel filler door.

Fig 2: Identifying Locking Cap -2-

Courtesy of AUDI OF AMERICA, LLC

-- Remove the locking cap -2- from the reducing agent filler tube.

NOTE:

Ignore item -1-.

-- Drain the reducing agent inside the active tank as far as possible into the drip tray using a hose.

-- Close open lines and connections with clean plugs from the Engine Bung SetVAS6122.

After Filling, the Following Steps Must Be Performed:

-- Adapt the adaptation value after draining reducing agent or replacing components. Refer to SELECTIVE CATALYTIC REDUCTION- ADAPTATION VALUE, RESETTING .