transmission AUDI A3 1999 8L / 1.G AEB ATW Engines Exhaust System Components Workshop Manual
[x] Cancel search | Manufacturer: AUDI, Model Year: 1999, Model line: A3, Model: AUDI A3 1999 8L / 1.GPages: 35, PDF Size: 0.46 MB
Page 5 of 35

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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Page 11 of 35

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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Page 17 of 35

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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Page 18 of 35

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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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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