AUDI A4 2000 B5 / 1.G AFC Engine Oxygen Sensor Control Checking Before Converter Workshop Manual

AUDI A4 2000 B5 / 1.G AFC Engine Oxygen Sensor Control Checking Before Converter Workshop Manual A4 2000 B5 / 1.G AUDI AUDI https://www.carmanualsonline.info/img/6/1036/w960_1036-0.png AUDI A4 2000 B5 / 1.G AFC Engine Oxygen Sensor Control Checking Before Converter Workshop Manual

Page 1 of 7

AUDI A4 2000 B5 / 1.G AFC Engine Oxygen Sensor Control Checking Before Converter Workshop Manual 24-45
 
     
Oxygen Sensor (O2S) control, 
checking (before three way 
catalytic converter) 
     
Note:  
     
G39 = Heated Oxygen Sensor (HO2S), bank 
1 
     G108 = Heated Oxygen Sensor (HO2S) 2,

Page 2 of 7

AUDI A4 2000 B5 / 1.G AFC Engine Oxygen Sensor Control Checking Before Converter Workshop Manual 1 2 3 4 
Display fields 3 and 4 show the signal voltages of both heated oxygen 
sensors.  
If sensor voltage fluctuates very slowly   page 24
-41
 .  
Pa
ge 2 of 7 Ox
yg
en Sensor 
(O2S
) control, che

Page 3 of 7

AUDI A4 2000 B5 / 1.G AFC Engine Oxygen Sensor Control Checking Before Converter Workshop Manual 24-46
       If a constant sensor voltage of 0.000V is 
displayed, there is a short to Ground (GND).  
     
-  Check DTC memory   Repair Group 01.      If sensor voltage is constant between 0.350 and

Page 4 of 7

AUDI A4 2000 B5 / 1.G AFC Engine Oxygen Sensor Control Checking Before Converter Workshop Manual Input displa
y group number XXX
Pa
ge 4 of 7 Ox
yg
en Sensor 
(O2S
) control, checkin
g (before three wa
y catal
ytic converter
)
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t

Page 5 of 7

AUDI A4 2000 B5 / 1.G AFC Engine Oxygen Sensor Control Checking Before Converter Workshop Manual 24-47
       With a properly functioning oxygen sensor, the 
actual control learning values can be checked.  
      Various malfunctions (e.g. intake air leakage, 
faulty fuel injectors etc.) can caus

Page 6 of 7

AUDI A4 2000 B5 / 1.G AFC Engine Oxygen Sensor Control Checking Before Converter Workshop Manual by ...% shorter, so that   = 1 can be obtained.  
Pa
ge 6 of 7 Ox
yg
en Sensor 
(O2S
) control, checkin
g (before three wa
y catal
ytic converter
)
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
p

Page 7 of 7

AUDI A4 2000 B5 / 1.G AFC Engine Oxygen Sensor Control Checking Before Converter Workshop Manual 24-48
      
-  Press buttons -0-, -0- and -5- to input display 
group number 005 for bank 1, or press buttons -
0-, -0- and -6- to input display group number 006 
for bank 2. 
     
-  Press -Q- butt