AUDI A3 1999 8L / 1.G AEB ATW Engines Exhaust System Components User Guide

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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26-9


CAUTION!
Flexpipe must not be bent more than 10 ,
otherwise it may be damaged. 11 -
Front exhaust pipe
With flexpipe
To remove, unbolt floor crossmember (20
Nm/15 ft lb)
Align exhaust system free of stress Page 26
-
24

12 -
Double clamp
Before tightening, ensure exhaust system
is free of stress Page 26
-24

Installation position: bolt ends point toward
left Installation position of bolt ends Page 26
-13
, Fig. 3

Tighten bolts evenly
13 -
Nut 40 Nm (30 ft lb)
14 -
Mount
15 -
Bolt
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25 Nm (18 ft lb)
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26-10


16 -
Rear muffler
Factory-installed with front muffler as one
unit. If repair is necessary, replace
separately Separating point Page 26
-16
Align exhaust system free of stress
Page 26
-24

17 -
Mount
18 -
Bolt
25 Nm (18 ft lb)
19 -
Bolt 25 Nm (18 ft lb)
20 -
Mount
21 -
Nut 40 Nm (30 ft lb)
22 -
Double clamp Used when front or rear muffler is replaced
separately. Before tightening, ensure exhaust system
is free of stress Page 26
-24

Installation position: bolt ends point toward
left
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Installation position of bolt ends Page 26
-13
, Fig. 3

Tighten bolts evenly
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26-11


23 -
Support ring
24 -
Bolt
25 Nm (18 ft lb)
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26-12


Fig. 1 Individual mounting components for vehicles with manual
transmission
1 - Buffer
2 - Spacer sleeve
3 - Washer
4 - Strap, right
5 - Washer
6 - Bolt (25 Nm/18 ft lb)
7 - Spacer sleeve
8 - Strap, left
9 - Compression spring
10 - Bolt (25 Nm/18 ft lb)
11 - Self-locking nut (25 Nm/18 ft lb)
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26-13


Fig. 2 Individual mounting components for vehicles with
automatic transmission
1 - Washer
2 - Buffer
3 - Strap
4 - Spacer sleeve
5 - Bolt (25 Nm/18 ft lb)
6 - Bolt
7 - Washer
8 - Compression spring
9 - Spacer sleeve
10 - Self-locking nut (25 Nm/18 ft lb)

Fig. 3 Double clamp installation position
- Install double clamp so bolt ends do not project over lower edge of
double clamp.
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26-14

Front and rear muffler, separating


Connecting pipe has a designated separating
point on connecting pipe for separate
replacement of front and/or rear muffler.
Separating point is marked by a depression in
the pipe.

Special tools and equipment
VAG1523 saw

Front-wheel-drive vehicles

- Using VAG1523 saw, cut exhaust pipe at separating point (arrow) at
right angle.
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26-15

- When installing, center double clamp over
separating point.


Double clamp -1- installation position: level, bolt ends pointing
downward
Install double clamp so that bolt ends don't project over lower edge
of double clamp Page 26
-13
, Fig. 3

- Install exhaust system free of stress Page 26
-24
.
- Tighten double clamp bolts evenly to 40 Nm (30 ft lb).
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