checking oil AUDI A4 1999 B5 / 1.G AWM Engine Oxygen Sensor Control Checking Workshop Manual

24-78
Display group 032 Display field: 1 / 2
Possible cause
Corrective action
Oxygen sensor adaptation
values below specified
range
Leak in intake area (pressure side between
turbocharger and intake manifold) - Check intake system for leaks and
repair false air Page 24
-68



Oil thinning- Oil change or perform swift country road
test

High oil consumption

Mass Air Flow (MAF) sensor faulty- Mass Air Flow (MAF) sensor, checking
Page 24
-59



Evaporative Emission (EVAP) canister purge
regulator valve remains stuck in open
position - Check Evaporative Emission (EVAP)
canister purge regulator valve Page
24
-114



Fuel pressure too high- Check fuel pressure regulator Page
24
-32



Fuel injector does not close- Check fuel injectors Page 24
-37
.


Oxygen sensor heating faulty
Oxygen sensor faulty- Check oxygen sensor heating Page
24
-89

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ge 8 of 46 Ox
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11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
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24-94

Heated Oxygen Sensor (HO2S) and
oxygen sensor control after Three Way
Catalytic Converter (TWC), checking


Note:
The oxygen sensor before catalytic converter
(bank 1, sensor 1) regulates to Lambda 1. If this
oxygen sensor is damaged, e.g. due to soiling or
overheating, the regulation value may have
shifted. Deviations from Lambda 1 are detected
by the oxygen sensor after catalytic converter
(bank 1, sensor 2). If it recognizes the deviations
downward or upward, it influences the regulation
before catalytic converter, generally increasing or
decreasing it respectively.
Pa
ge 26 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