sensor AUDI A6 1995 C5 / 2.G AEB ATW Engines Exhaust System Components Workshop Manual

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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26-4


CAUTION!
Part numbers are listed here for reference only.
Always check with your Parts department for
the latest information. 12 -
Heated Oxygen Sensor (HO2S)
50 Nm (37 ft lb)Only grease threads with "G 052 112 A3."
Do NOT allow grease to get into slots on
sensor body

Checking Repair Manual, 1.8 Liter 4-Cyl. 5V
Turbo Fuel Injection &Ignition, Repair Group 24
13 -
Nut
Always replace25 Nm (18 ft lb)
14 -
Bolt 25 Nm (18 ft lb)
15 -
16Mount
Different versions for manual and automatic
transmissions Manual transmission Page 26
-12
, Fig.
1

Automatic transmission Page 26
-13
,
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26-8


7 -
Heated Oxygen Sensor (HO2S)
50 Nm (37 ft lb)Only grease threads with "G 052 112 A3."
Do NOT allow grease to get into slots on
sensor body Checking Repair Manual, 1.8 Liter 4-Cyl.
5V Turbo Fuel Injection &Ignition, Repair
Group 24 Disconnect Heated Oxygen Sensor
(HO2S) harness connector Page 26
-21

8 -
Nut
Always replace25 Nm (18 ft lb)
9 -
Bolt 25 Nm (18 ft lb)
10 -
Mount
Different versions for manual and automatic
transmissions Manual transmission Page 26
-12
, Fig.
1

Automatic transmission Page 26
-13
,
Fig. 2

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26-17

Exhaust manifold, 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.

- 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).
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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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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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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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