fuel filter AUDI A4 1997 B5 / 1.G AFC Engine On Board Diagnostic Multiport Fuel Injection Workshop Manual

01-61


Fuel system pressure too low because of:
- Leaks in the area of the fuel lines or the fuel distributor strip
- Vacuum line to the fuel pressure regulator or fuel pressure
regulator faulty
- Fuel filter plugged
- Fuel pump delivery quantity too low

- Check system pressure and residual pressure
page 24
-20


Malfunction cause found: Yes
No

- Erase DTC memory, test drive and check DTC
memory

EVAP canister purge regulator valve -N80- sticks
mechanically in closed position

- Check EVAP canister purge regulator valve -
N80- page 24
-58


Malfunction cause found: Yes


- Erase DTC memory, test drive and check DTC
memory
Notes:
If the malfunctions "P0171 / 16 555 and P0174 / 16558"are set, is set, the oxygen sensor control has exceeded the learning
value limit in the "rich" direction, but the (HO2S) still recognizes "mixture too lean".
Pa
ge 85 of 366 On Board Dia
gnostic
(OBD
) - Multi
port Fuel In
jection
(MFI
)
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.01.1