1998 AUDI A4 heater

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 2, sensor 1

Functional
range 0 = off
1 = on 0 = off
1 = on

Specified
value 1 1 1 1 1 0

Note
If specified value is not obtained Page 24
-81

If specified value is obtained but there is a malfunction stored in DTC memory Check oxygen
sensor adaptation values and control, Page 24
-75

Significance of 3 digit indications in display group 030 X
X
X
Display fields 1 and 2
X Oxygen sensor control: 0= not active; 1 = active
X Operational readiness of oxygen sensor: 0= not active; 1 = active
X Condition of oxygen sensor heater: 0= not active; 1 = active
Note:
The first field of the 3 digit indication (heating) fluctuates between 0 and 1.
Pa
ge 4 of 46 Ox
yg
en sensor control, checkin
g
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU07.24.2

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 possible residue and repeat test.
If specified value in display field 1 is not obtained
even after road test or if value does not fluctuate
at least 2 %:

- Check primary voltage Page 24
-81
.

- Test oxygen sensor heater before catalytic
converter Page 24
-89
.

- Check oxygen sensor before catalytic converter
for aging Page 24
-84
.
Pa
ge 7 of 46 Ox
yg
en sensor control, checkin
g
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU07.24.2

24-89


Oxygen sensor heating, Oxygen Sensor
(O2S) Heater -Z19- before catalytic
converter, checking

Special Tools and Equipment

VAG1526A
VAG1594A
VAG1598/31
Pa
ge 19 of 46 Ox
yg
en sensor control, checkin
g
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU07.24.2

24-98


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 2, sensor 1

Functional range 0 = off
1 = on 0 = off
1 = on

Specified value 1 1 1
1 1 0

Note
If specified value is not obtained Page 24
-107

Significance of 3 digit indications in display group 030 X
X
X
Display fields 1 and 2
X Oxygen sensor control: 0= not active; 1 = active
X Operational readiness of oxygen sensor: 0= not active; 1 = active
X Condition of oxygen sensor heater: 0= not active; 1 = active
Notes:

The first position of the 3 digit indication (heating) fluctuates between 0 and 1.
Oxygen sensor control of oxygen sensor after catalytic converter (B1-S2) is not active without engine load.
Pa
ge 30 of 46 Ox
yg
en sensor control, checkin
g
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU07.24.2

24-107


Oxygen sensor heating, Oxygen Sensor
(O2S) Heater 1 -Z29- after catalytic
converter, checking

Special Tools and Equipment

VAG1526A
VAG1594A
VAG1598/31
Pa
ge 39 of 46 Ox
yg
en sensor control, checkin
g
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU07.24.2