Reducing Agent Tank, Removing And Installing: Removing

-- Empty the reducing agent tank, refer to REDUCING AGENT TANK, DRAINING .

-- Remove the rear left cover for the underbody, refer to UNDERBODY PANELS, REMOVING AND INSTALLING .

-- Disconnect the connector -1-.

Fig 1: NOx Sensor 2 -G687- with NOx Sensor Control Module 2 -J881- Component Location

Courtesy of AUDI OF AMERICA, LLC

-- Remove the nuts -arrows- for the NOx Sensor Control Module 2 -J881-.

-- Free up the wire.

-- Remove the metering line -2- by pressing the release buttons.

Fig 2: Identifying Metering Line And Connectors

Courtesy of AUDI OF AMERICA, LLC

-- Disconnect the connectors -1 and 3- and free up the wiring harness.

NOTE:

To catch escaping reducing agent place a clean cloth under the separation point.

Fig 3: Identifying Filling Hose

Courtesy of AUDI OF AMERICA, LLC

-- Press the release button and disconnect the filling hose -1-.

-- Disconnect the vent line -2-, by pressing the blue slider -4- to loosen the retaining tabs -3-.

-- Seal the open lines and connections with clean plugs from the Engine Bung Set VAS 6122.

Fig 4: Identifying Engine/Gearbox Jack VAS 6931

Courtesy of AUDI OF AMERICA, LLC

-- Place the Engine/Gearbox Jack VAS 6931 with a soft foam pad in-between to support the tank.

-- With a second mechanic to hold the tank -1-, remove bolts -arrow- by hand.

Fig 5: Identifying Tank Bolts

Courtesy of AUDI OF AMERICA, LLC

-- Lower the tank using the Engine and Gearbox Jack VAS 6931. Guide the tank with one hand while lowering it.

-- Seal the open lines and connections with clean plugs from the Engine Bung Set VAS 6122.