catalytic converter AUDI A6 1998 C5 / 2.G AEB ATW Engines Exhaust System Components Workshop Manual
[x] Cancel search | Manufacturer: AUDI, Model Year: 1998, Model line: A6, Model: AUDI A6 1998 C5 / 2.GPages: 35, PDF Size: 0.46 MB
Page 4 of 35

26-3
5 -
Bolt
25 Nm (18 ft lb)
6 -
Mount
7 -
Gasket Always replace
8 -
Nut Always replace30 Nm (22 ft lb)
9 -
Gasket Always replace
10 -
Turbocharger Removing and installing Page 21
-30
11 -
Three Way Catalytic Converter (TWC)
Protect from damageRemoving and installing Page 26
-21
Disconnect Heated Oxygen Sensor
(HO2S) harness connector Page 26
-21
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Page 10 of 35

26-7
All-wheel-drive vehicles
1 -
Front muffler
Factory-installed with rear muffler as one
unit. If repair is necessary, replace
separately Separating point Page 26
-16
Align exhaust system free of stress
Page 26
-24
2 -
Gasket
Always replace
3 -
Nut Always replace30 Nm (22 ft lb)
4 -
Gasket Always replace
5 -
Turbocharger Removing and installing Page 21
-30
6 -
Three Way Catalytic Converter (TWC)
Protect from damageRemoving and installing Page 26
-21
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Page 27 of 35

26-21
Three Way Catalytic Converter (TWC),
removing and installing
Removing
Note:
Replace gaskets and self-locking nuts.
Flexpipe in front exhaust pipe must not be bent
more than 10 , otherwise it may be damaged.
- Disconnect harness connector for heated oxygen sensor (arrow) and
set aside.
Note: - Remove coolant expansion tank -2- (arrows)
- Remove wiring from Engine Coolant Level (ECL) warning switch -F66-
and lay coolant expansion tank to side.
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Page 29 of 35

26-22
- Remove air guide duct between cowl and air
cleaner housing.
- Remove air cleaner housing cover.
- Remove the following lines/harness connectors:
1 - At wastegate bypass regulator valve -N75-
2 - At Evaporative Emissions (EVAP) purge regulator valve -N80-
3 - At power output stage -N122-
4 - At Mass Air Flow (MAF) sensor -G70-
- Pull off hose connections and remove air cleaner housing (arrows).
- Remove Heated Oxygen Sensor (HO2S) from Three Way Catalytic
Converter (TWC).
- Remove bolts between front exhaust pipe and Three Way Catalytic
Converter (TWC).
- Unbolt transmission mount for exhaust system at exhaust system.
- Remove bolts between three Three Way Catalytic Converter (TWC)
and turbocharger.
- Remove Three Way Catalytic Converter (TWC) toward top.
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Page 30 of 35

26-23
Installing
Installation is the reverse of removal, noting the
following:
Only grease threads of oxygen sensor with
"G 052 112 A3." Do NOT allow grease to get
into slots on sensor body.
Align exhaust system free of stress Page 26
-24
.
Tightening torques
Components
Tightening
torques
Front exhaust pipe to three way
catalytic converter 25 Nm (18 ft
lb)
Front exhaust pipe to
transmission mount 25 Nm (18 ft
lb)
Three way catalytic converter to
turbocharger 30 Nm (22 ft
lb)
Heated oxygen sensor to three
way catalytic converter 50 Nm (37 ft
lb)
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Page 35 of 35

26-28
Exhaust system, checking for leaks
- Start engine and run at idle.
- Seal tailpipes with cloths or equivalent for
duration of leak test.
- Listen for leaks at following connections:
cylinder head/exhaust manifold, exhaust
manifold/turbocharger, turbocharger/Three Way
Catalytic Converter (TWC), etc.
- Repair leaks.
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g and installin
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11/18/2002 htt
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yp
e=re
pair&id=AUDI.B5.GE02.26.1