Audi Workshop Service and Repair Manuals

Removing and installing particulate filter Special tools and workshop equipment required

t  -3253/5- from assembly tool -3253-

t  Tool set, 17 mm -T10395- t  Flange bolt M10x35 Removing –  Remove Lambda probe -G39- → Rep. gr.23. –  Remove pressure differential sender -G505- with control pipes → Rep. gr.23. –  Remove exhaust gas pressure sensor 1 -G450- → Rep. gr.23. –  Remove filter → Chapter. –  Remove exhaust gas temperature sender 2 -G448- → Chapter. –  Remove exhaust gas temperature sender 3 -G495- → Chapter.

–  Remove nuts -arrows- and detach front cross member on vehicle underside. –  Unplug connector -1-.

–  Remove nuts -1- and -2- and detach rear cross member on vehicle underside. –  Remove centre silencer → Chapter.

–  Unscrew nuts -arrows- and pull underbody cover down slightly.

–  Unplug electrical connector -2- and move wiring clear. –  Loosen clamp -1- and remove ammonia trap, exhaust flap control unit -J883- and NOx storage catalytic converter as one unit.

–  Remove nuts -arrows-. –  Remove lock washers -2- and -3-. –  Pull inner side of cover on vehicle underside down slightly until heat shield -1- for centre tunnel can be detached. –  Remove front right wheel.

–  Remove bolts -arrows- and detach heat shield for drive shaft (right-side). –  Unbolt drive shaft (right-side) from gearbox flange.

–  Mark installation position of exhaust gas temperature sender 4 -G648--item 1-. –  Unscrew exhaust gas temperature sender 4 -G648- from exhaust pipe behind particulate filter using a tool from tool set, 17 mm -T10395-.   Note Disregard -item 2-.

–  Remove nuts -1- and detach bracket for particulate filter.

–  Remove bolts -2- and -3- securing pendulum support.   Note Disregard -item 1-.

–  Press engine/gearbox assembly towards lock carrier and support via pendulum support as shown in illustration. A -  Flange bolt M10x35   Caution Avoid damage to flexible joint. Do NOT bend flexible joint in front exhaust pipe more than 10°.

–  Remove bolts -arrows- securing bracket for exhaust system.

–  Remove particulate filter by rotating through 180° and about its own axis. Installing Installation is carried out in the reverse order; note the following: Tightening torques l  → Chapter „Particulate filter and NOx storage catalytic converter - exploded view“. l  → Chapter „Exhaust flap control unit -J883- with ammonia trap - exploded view“ l  → Chapter „Centre silencer - exploded view“ l  → Chapter „Exhaust gas temperature control - exploded view“   Note t  Renew gaskets, self-locking nuts and clamp for particulate filter. t  Fit all cable ties in the original positions when installing. t  Attach exhaust gas temperature sender 4 in line with marking and secure. –  Installation position of clamps on exhaust system → Chapter. –  Install filter → Chapter. –  Install underbody cover → Rep. gr.66. –  Install pendulum support → Rep. gr.34. –  Install drive shaft → Rep. gr.40. –  Install heat shield for drive shaft (right-side) → Fig.. –  Align the exhaust system so it is free of stress → Chapter. –  Install Lambda probe -G39-, exhaust gas pressure sensor 1 -G450- and pressure differential sender -G505- → Rep. gr.23. –  After renewing particulate filter, perform Adaption in Guided Functions → Vehicle diagnostic tester.