AUDI A4 2000 B5 / 1.G AWM Engine Oxygen Sensor Control Checking Workshop Manual

AUDI A4 2000 B5 / 1.G AWM Engine Oxygen Sensor Control Checking Workshop Manual A4 2000 B5 / 1.G AUDI AUDI https://www.carmanualsonline.info/img/6/1094/w960_1094-0.png AUDI A4 2000 B5 / 1.G AWM Engine Oxygen Sensor Control Checking Workshop Manual

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AUDI A4 2000 B5 / 1.G AWM Engine Oxygen Sensor Control Checking Workshop Manual 24-71
 
  
Oxygen sensor control, 
checking Oxygen sensor and oxygen sensor control 
before catalytic converter, checking
 
Special Tools and Equipment  
 
VAG1526A
 VAG1594A
 VAG1598/31
 VAS5051 with

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AUDI A4 2000 B5 / 1.G AWM Engine Oxygen Sensor Control Checking Workshop Manual 24-72
      
Test requirements:  
     
Exhaust system free of leaks. 
     Coolant Temperature at least 80  C. 
     
Test sequence  
     
- Connect VAS5051 tester   Page 01
-7 and 
select vehicle s

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AUDI A4 2000 B5 / 1.G AWM Engine Oxygen Sensor Control Checking Workshop Manual 24-73
 
    
Display on VAS5051:  
1 - Enter display group Max. input value = 255
-  Select function "030" in button field -2- for "display group number 030" 
and press Q button to confirm input.

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AUDI A4 2000 B5 / 1.G AWM Engine Oxygen Sensor Control Checking Workshop Manual 24-74
 
  
Display fields  
  
1   2   3   4  
Display group 030: Oxygen sensor status  
Display  
X X X   X X X  
    
Indicated  
Oxygen sensor status, bank 1, sensor 1   Oxygen sensor status, bank

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AUDI A4 2000 B5 / 1.G AWM Engine Oxygen Sensor Control Checking Workshop Manual 24-75
 
    
Display on VAS5051:  
Checking oxygen sensor adaptation values and control   -  Do not continue test until indication in display field -1- has 
reached "111" at least once. 
- 
Press   bu

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AUDI A4 2000 B5 / 1.G AWM Engine Oxygen Sensor Control Checking Workshop Manual 24-76
      
- 
Press   button to change into display group 
033.      
-  Check oxygen sensor control in display fields -1-
and -2-. 
  
Display fields  
  
1   2   3   4  
Display group 033: Oxygen

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AUDI A4 2000 B5 / 1.G AWM Engine Oxygen Sensor Control Checking Workshop Manual 24-77
      
Continuation  
      If specified value in display field 1 is not obtained 
or if value does not fluctuate at least 2 %:  
     
-  Road test vehicle in order to free oxygen sensor 
of po

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AUDI A4 2000 B5 / 1.G AWM Engine Oxygen Sensor Control Checking Workshop Manual 24-78
 Display group 032  Display field: 1 / 2  
Possible cause  
Corrective action  
Oxygen sensor adaptation 
values below specified 
range   
Leak in intake area (pressure side between 
turbocharge

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AUDI A4 2000 B5 / 1.G AWM Engine Oxygen Sensor Control Checking Workshop Manual 24-79
 Display group 032  Display field: 1 / 2  
Possible cause  
Corrective action  
Oxygen sensor adaptation 
values via specified range  
False air in intake area- Check intake system for leaks and

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AUDI A4 2000 B5 / 1.G AWM Engine Oxygen Sensor Control Checking Workshop Manual 24-80
 Evaluation display group 033  Display field: 
2  
Possible cause  
Corrective action  
larger than 
4.800 V   
Short circuit to B+ in wire connections between 
oxygen sensor and control module
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