AUDI A4 1995 B5 / 1.G APB Engine Oxygen Sensor Control Checking Workshop Manual

AUDI A4 1995 B5 / 1.G APB Engine Oxygen Sensor Control Checking Workshop Manual A4 1995 B5 / 1.G AUDI AUDI https://www.carmanualsonline.info/img/6/1055/w960_1055-0.png AUDI A4 1995 B5 / 1.G APB Engine Oxygen Sensor Control Checking Workshop Manual

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AUDI A4 1995 B5 / 1.G APB Engine Oxygen Sensor Control Checking Workshop Manual 24-79
 
     
Oxygen sensor control, 
checking 
     
Function of oxygen sensor control
 
      The oxygen sensors compare the oxygen 
content in the air with the residual oxygen 
content in the exhau

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AUDI A4 1995 B5 / 1.G APB Engine Oxygen Sensor Control Checking Workshop Manual 24-80
       If the voltage does not change or only changes 
slowly the following malfunctions are possible:  
     
Slits or holes in probe head are blocked.
     Oxygen sensor has been subjected to

Page 3 of 61

AUDI A4 1995 B5 / 1.G APB Engine Oxygen Sensor Control Checking Workshop Manual 24-81
 
  
Oxygen sensor and oxygen sensor control 
before Three Way Catalytic Converter 
(TWC), checking
 
Special tools and shop equipment  
 
Fluke 83 (or equivalent) A
 VAG1594 A
 VAG1598/31
 VAS5

Page 4 of 61

AUDI A4 1995 B5 / 1.G APB Engine Oxygen Sensor Control Checking Workshop Manual 24-82
      
Notes:  
     
For the defined troubleshooting procedure, it is 
possible to switch off the oxygen sensor control 
by selecting Display Group 99 in "Basic Setting" 
mode and to switch it

Page 5 of 61

AUDI A4 1995 B5 / 1.G APB Engine Oxygen Sensor Control Checking Workshop Manual 24-83
      
Checking function  
     
-  Connect vehicle diagnostic, testing and 
information system VAS5051 or VAG1551 scan 
tool and select engine electronics control 
module by entering address wo

Page 6 of 61

AUDI A4 1995 B5 / 1.G APB Engine Oxygen Sensor Control Checking Workshop Manual 24-84
      
Note:  
     The "Oxygen sensor status" display indicates the 
status of the oxygen sensor control and oxygen 
sensors. 
  
Display fields  
  
1  2  3  4  
Display Group 030: Oxygen sens

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AUDI A4 1995 B5 / 1.G APB Engine Oxygen Sensor Control Checking Workshop Manual 24-85
 Significance of 3 digit indication in Display Group 30  1  
1  
1  
Display fields 1 through 3  
      X   Oxygen sensor control  
0= inactive  
1= active  
   X      Operational readiness of o

Page 8 of 61

AUDI A4 1995 B5 / 1.G APB Engine Oxygen Sensor Control Checking Workshop Manual 24-86
      
Checking oxygen sensor adaptation and 
oxygen sensor control  
     
-  Connect vehicle diagnostic, testing and 
information system VAS5051 or VAG1551 and 
select engine electronics contr

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AUDI A4 1995 B5 / 1.G APB Engine Oxygen Sensor Control Checking Workshop Manual 24-87
      
-  Check oxygen sensor control in display fields 1 
to 4: 
  
Display fields  
  
1  2  3  4  
Display Group 33: Oxygen sensor control at idle speed  
Display  
xx.x %  
xx.x V  
xx.x %

Page 10 of 61

AUDI A4 1995 B5 / 1.G APB Engine Oxygen Sensor Control Checking Workshop Manual 24-88
 
System in Basic Setting 32  
1 
2 
3 
4
    
Indicated on display: (1 - 4   display fields)  -  Check oxygen sensor control in display fields 1 to 
4: 
  
Display fields  
  
1   2   3   4  
D
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