catalytic converter 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 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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