1996 AUDI A4 fuel pressure

24-89

If the specified values in display fields 1
and/or 3 do not match the specifications, or if
the readout does not fluctuate by at least 2
%:

- Check oxygen sensor heater Page 24
-114
.

- Check oxygen sensor signal wire and activation
Page 24
-122
.

- Check intake system for leaks and eliminate
false air Page 24
-76
.

- Check fuel pressure regulator Page 24
-33
.

- Fuel return line kinked or plugged.

-
Press button.
- Press button -0- and -6- to select function "End
Output" and confirm with -Q- button.

- Switch ignition off.
Pa
ge 11 of 61 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.FU04.24.2

24-90
Evaluation display group 032 Display group 32


Display fields: 1/3
Possible cause
Corrective action
Oxygen sensor adaptation
values in range:
-4.0 to -25.0 %
Oil thinning- Carry out oil change or carry out
road test on highway
Display fields: 2/4
High oil consumption
Oxygen sensor adaptation
values in range:
-4.0 to -25.0 % Mass Air Flow (MAF) Sensor faulty- Check Mass Air Flow (MAF) Sensor
Page 24
-59


EVAP canister purge regulator valve remains in
stuck in open position - Check EVAP canister purge
regulator valve Page 24
-134


Fuel pressure too highFuel return line kinked or pluged- Check fuel pressure regulator
Page 24
-33

- Check fuel return line

Fuel injector leaking- Check fuel injectors Page 24
-39
Pa
ge 12 of 61 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.FU04.24.2

24-91
Evaluation display group 032 Display Group 32


Display fields: 1/3
Possible cause
Corrective action
Oxygen sensor adaptation
values in range:
4.0 and 25.0 %
Un-metered air in intake area- Check intake system for un-metered
air and eliminate leaks
Display field: 2/4
Fuel pressure too low- Check fuel pressure regulator Page
24
-33

Oxygen sensor adaptation
values in range:
4.0 - 25.0 %
Oxygen sensor heater faulty- Check oxygen sensor heater Page
24
-114


Injector not opening or only opening partially - Check injectors Page 24
-39

EVAP canister purge regulator valve remains
in stuck in open position - Check EVAP canister purge
regulator valve Page 24
-134
Pa
ge 13 of 61 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.FU04.24.2