Audi Workshop Service and Repair Manuals

Removing and installing front exhaust pipe with catalytic converter

Removing –  Remove centre noise insulation -fasteners 1 ... 3-.

–  Remove underbody cover (right-side) -arrows-.

–  Unplug electrical connector -1- for Lambda probe after catalytic converter -G130-. –  Remove the plug connector from the bracket -2- and move the Lambda probe wiring clear.

–  Remove front cross-piece for underbody -arrows-.   Note To avoid damage, the flexible joints in the front exhaust pipe must not be bent more than 10°. –  Disconnect exhaust system at clamp -1-.

–  Unbolt bracket for exhaust system -arrows-.

–  Unbolt heat shield for drive shaft (right-side) -arrows-.

–  Remove securing nuts -arrows- on front exhaust pipe/exhaust manifold. –  Detach front exhaust pipe with catalytic converter.

Installing Installation is carried out in the reverse order; note the following:   Note Renew gaskets and self-locking nuts. –  Fasten the front exhaust pipe to the exhaust manifold using the tightening sequence shown. –  Align exhaust system so it is free of stress → Chapter. Tightening torques

Component	Nm
Front exhaust pipe to exhaust manifold	25 1)2)
Drive shaft heat shield to cylinder block	35
Bracket for exhaust system to subframe	23
Front tunnel cross-piece to body	23
l  1) Lubricate exhaust manifold studs with high-temperature paste. For high-temperature paste refer to → Electronic parts catalogue. l  1) Renew self-locking nuts.