catalytic converter AUDI A4 1995 B5 / 1.G AEB Engine OBD and DTC

01-2

Malfunction Indicator Lamp (MIL)
function, checking

If a malfunction is recognized by the Engine
Control Module (ECM), this is indicated by the
MIL coming on.

Malfunction Indicator Lamp (MIL)
Note:
When a recognized malfunction switches on the MIL, it will either blink or
light continuously. In either case, DTC memory must be checked Page 01
-15
.
If the MIL starts to blink, there is a malfunction that can lead to
damage of the Three Way Catalytic Converter (TWC). In this case,
driving should only continue using reduced power. The malfunction
must be rectified as quickly as possible. If the MIL lights continuously, there is a malfunction that affects
exhaust emissions. In this case, DTC memory must be checked, and
the malfunction must be rectified as quickly as possible. Some malfunctions may occur without causing the MIL to come on.
When driveability or performance problems are reported, and there is
no indication from the MIL, the operation of the MIL must be checked.
In addition, DTC memory must be checked, as there may be
malfunctions stored that do not switch the MIL on immediately.
Pa
ge 3 of 57 On Board Dia
gnostic
(OBD
)
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yp
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pair&id=AUDI.B5.FU02.01.1

01-20

Diagnostic Trouble
Code (DTC)
Malfunction text
MIL
Corrective action
SAE
VAG



P0136 16520 O2 Sensor Circ., Bank1-
Sensor2
Malfunction 2
Dcy - Check Oxygen Sensor (O2S) behind Three Way Catalytic
Converter (TWC) -G130- Page 24
-35

P0137 16521 O2 Sensor Circ., Bank1-
Sensor2
Low Voltage
P0138 16522 O2 Sensor Circ., Bank1-
Sensor2
High Voltage
P0140 16524 O2 Sensor Circ., Bank1-
Sensor2
No Activity Detected
Pa
ge 30 of 57 On Board Dia
gnostic
(OBD
)
11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU02.01.1

01-22

Diagnostic Trouble
Code (DTC)
Malfunction text
MIL
Corrective action
SAE
VAG



P0327 16711 Knock Sensor 1
Circ.
Low Input Immed.
- Check knock sensors and knock sensor control Page 28
-5
P0332 16716 Knock Sensor 2
Circ.
Low Input
- Check knock sensors and knock sensor control Page 28
-5
P0422 16806 Main Catalyst,
Bank1
Efficiency Below
Threshold 2 Dcy
Repair Manual, 1.8 Liter 4
-Cyl. 5V Turbo Engine Mechanical,
Engine Code(s): AEB, ATW, Repair Group 26.
- Replace Three Way Catalytic Converter (TWC):
P0441 16825 EVAP Emission
Contr. Sys.
Incorrect Purge
Flow 2 Dcy
- Check Evaporative Emissions (EVAP) canister purge regulator
valve output Diagnostic Test Mode (DTM), page Page 01
-42

Pa
ge 33 of 57 On Board Dia
gnostic
(OBD
)
11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU02.01.1

01-25

Diagnostic Trouble
Code (DTC)
Malfunction text
MIL
Corrective action
SAE
VAG



P1127 17535 Long Term Fuel Trim
mult., Bank1
System too Rich
1)
2
Dcy - Check Mass Air Flow (MAF) sensor -G70- Page 24
-57

- Check HO2S -G39- and O2S control Page 24
-17

- Check Oxygen Sensor (O2S) behind Three Way Catalytic
Converter (TWC) -G130- Page 24
-35


- Check fuel pressure regulator and residual fuel pressure
Page 24
-93


- Check fuel injectors Page 24
-87
- Output Diagnostic Test Mode (DTM) Page 01
-42
1) The term "mult." = multiplicative; applies to entire engine speed (RPM) and load range.
Pa
ge 38 of 57 On Board Dia
gnostic
(OBD
)
11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU02.01.1

01-26

Diagnostic Trouble
Code (DTC)
Malfunction text
MIL
Corrective action
SAE
VAG



P1128 17536 Long Term Fuel Trim
mult., Bank1
System too Lean
1)
2
Dcy - Check HO2S -G39- and O2S control Page 24
-17

- Check Oxygen Sensor (O2S) behind Three Way Catalytic
Converter (TWC) -G130- Page 24
-35


- Check fuel pressure regulator and residual fuel pressure
Page 24
-93


- Check fuel injectors Page 24
-87
- Output Diagnostic Test Mode (DTM) Page 01
-42

- Check EVAP canister purge regulator valve output
Diagnostic Test Mode (DTM), page Page 01
-42

1) The term "mult." = multiplicative; applies to entire engine speed (RPM) and load range.
Pa
ge 39 of 57 On Board Dia
gnostic
(OBD
)
11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU02.01.1