1999 AUDI A4 engine

01-81


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

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 position of the 3 digit indication (heating) fluctuates between 0 and 1 at certain operation points.
Oxygen sensor control of oxygen sensor behind catalytic converter (bank 1, sensor 2) is not active without engine load,
meaning that the third position of the 3-digit display is 0.

-
Do not start test until indication in display field 1
Pa
ge 19 of 35 Readiness code11/21/2002 htt
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01-82

Work step 6: Diagnostic of oxygen sensor
aging before catalytic converter

Test requirement:

Engine continues to run at 2000 RPM.
Basic Settin
g
Q
Enter display group number XXX

When indicated on display
- Press buttons -0-, -3- and -4- to select "display group number 034" and
press -Q- button to confirm input.
System in basic setting 34
1
2
3
4

When indicated on display
Note:
A few minutes may pass until a diagnostic result is reached. - Check specified value in display field 4:
Pa
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e=re
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01-83


Display fields

1 2 3 4
Display group 034: Oxygen sensor aging diagnostic, oxygen sensor before catalytic converter (bank 1)
Display xxxx/min
xxx C
x.x s
---
Indicated Engine speed
(RPM) Exhaust
temperature Period duration Oxygen sensor
before Catalytic converter Diagnostic condition
Functional
range Test OFF
Test ON
B1-S2 OK
B1-S2 not OK
Specified
value 2000 RPM more than 350
C
0.0 to 1.0 s B1-S2 OK
Note



If "B1-S1 not OK" is displayed:
Check DTC memory Page 01
-16
.
If specified value "B1-S1 OK" is obtained:

- Press -C- button.
Pa
ge 22 of 35 Readiness code11/21/2002 htt
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yp
e=re
pair&id=AUDI.B5.FU06.01.8

01-84

Work step 7: Diagnostic of operational
readiness of oxygen sensor behind catalytic
converter

Test requirement:

Engine continues to run at 2000 RPM.
Basic Setting
Q
Enter displa
y group number XXX

When indicated on display
- Press buttons -0-, -3- and -6- to select "display group number 036" and
press -Q- button to confirm input.
System in basic setting 36
1
2
3
4

When indicated on display
- Check specified value in display field 2:
Pa
ge 23 of 35 Readiness code11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
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yp
e=re
pair&id=AUDI.B5.FU06.01.8

01-86

Work step 8: Diagnostic of oxygen sensor
control system

Test requirement:

Engine continues to run at 2000 RPM.
Basic Settin
g
Q
Enter display group number XXX

When indicated on display
- Press buttons -0-, -3- and -7- to select "display group number 037" and
press -Q- button to confirm input.
System in basic setting 37
1
2
3
4

When indicated on display
- Check specified value in display field 4:
Pa
ge 25 of 35 Readiness code11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
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yp
e=re
pair&id=AUDI.B5.FU06.01.8

01-88

Work step 9: Diagnostic of catalytic converter

Test requirement:

Engine continues to run at 2000 RPM.
Basic Settin
g
Q
Enter displa
y group number XXX

When indicated on display
- Press buttons -0-, -4- and -6- to select "display group number 046" and
press -Q- button to confirm input.
System in basic setting 46
1
2
3
4

When indicated on display
Note:
Catalytic converter diagnostic lasts approx. 60 seconds. - Check specified values in display fields 2 and 4:
Pa
ge 27 of 35 Readiness code11/21/2002 htt
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yp
e=re
pair&id=AUDI.B5.FU06.01.8

01-89


Display fields

1 2 3 4
Display group 046: Diagnostic of catalytic converter (bank 1)
Display xxxx/min
xxx C
x.x
---
Indicated Engine speed
(RPM) Exhaust
temperature Measurement
Catalytic converter -
conversion Diagnostic condition
Functional
range Test OFF
Test ON
Cat B1 OK
Cat B1 not OK
Specified
value 2000 RPM more than
430 C
0.0 to 0.2 Cat B1 OK
Note



If "Cat B1 not OK" is displayed: Check DTC
memory Page 01
-16
. If no DTCs are stored,
replace catalytic converter.
If specified value "Cat B1 OK" is obtained:

- Press -C- button.
Pa
ge 28 of 35 Readiness code11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
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yp
e=re
pair&id=AUDI.B5.FU06.01.8

01-90

Work step 10: Diagnostic of Secondary Air
Injection (AIR) system

- Remove VAG1788/10 RPM adjuster and leave
engine running at idle.

Test requirement:

Engine running at idle:

Note:
During diagnostic of the Secondary Air Injection
(AIR) system, the Secondary Air Injection (AIR)
pump will run for several seconds.
Basic Settin
g
Q
Enter displa
y group number XXX

When indicated on display
- Press buttons -0-, -7- and -7- to select "display group number 077" and
press -Q- button to confirm input.
System in basic setting 77
1
2
3
4

When indicated on display
- Check specified value in display field 4:
Pa
ge 29 of 35 Readiness code11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU06.01.8