Audi Workshop Service and Repair Manuals

Removing and installing front exhaust pipe with starter catalytic converter

Removing –  Unclip air intake hose from air duct -arrows-.

–  Unplug electrical connector at intake air temperature sender 2 -G299--item 2-. –  Detach vacuum hose -1- from actuator for intake air preheater.

–  Pull dipstick -1- out of guide tube. –  Remove the engine cover together with air cleaner housing -arrows-. –  Re-insert dipstick in guide tube.

–  Detach rubber bellows -1- from air duct -2-. –  Release both retainers -arrows- and detach air duct.

–  Unbolt hot air collector plate -arrows-.

–  Unbolt front exhaust pipe from exhaust manifold -arrows-.

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

Vehicles with manual gearbox: –  Unplug electrical connector -2- for Lambda probe -G39-. –  Unplug electrical connector -1- for exhaust gas temperature sender 1 -G235- (if fitted). –  Unplug electrical connector -4- for reversing light switch -F4-. –  Move engine wiring harness at bracket -3- clear. –  Unscrew nut -arrow- and remove bracket with wiring from stud.

Vehicles with automatic gearbox: –  Unplug electrical connector -2- for Lambda probe -G39-. –  Unplug electrical connector -1- for exhaust gas temperature sender 1 -G235- (if fitted). –  Remove all electrical connectors from the bracket.

All models: –  Remove nuts -2- and -3- at exhaust pipe flange. –  Separate exhaust system at flange. –  Remove bolts -1- and -5-. –  Pull off bracket -4- for exhaust system from pins on front exhaust pipe.   Note

To avoid damage, the flexible joints in the front exhaust pipe must not be bent more than 30°. –  Unscrew bolts -arrows-. –  Swing front exhaust pipe forwards and remove.   Note Disregard -item 1-. Installing Install in reverse order. Tightening torques

Component	Nm
Front exhaust pipe to cylinder block	22
Front exhaust pipe to main catalytic converter	25 1)
Front exhaust pipe to exhaust manifold	40 1)
Bracket for exhaust system to subframe	25
Hot air collector plate to exhaust manifold	10
l  1) Renew bolts/nuts.