catalytic converter AUDI A8 1998 D2 / 1.G AHA Engine On Board Diagnostic Workshop Manual

01-2

Malfunction Indicator Lamp (MIL)
function, checking

If a malfunction is recognized by the Engine
Control Module (ECM) or the Transmission
Control Module (TCM), 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
-16
.
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.
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01-20

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



P0130 16514 O2 Sensor Circ.,
Bank1-Sensor1
Malfunction 2
Dcy - Check Heated Oxygen Sensor (HO2S) -G39- and O2S control
(bank 1, sensor1) page 24
-22

P0131 16515 O2 Sensor Circ.,
Bank1-Sensor1
Low Voltage
P0132 16516 O2 Sensor Circ.,
Bank1-Sensor1
High Voltage
P0133 16517 O2 Sensor Circ.,
Bank1-Sensor1
Slow Response 2
Dcy - Check HO2S -G39- aging (bank 1, sensor1) page 24
-60
P0134 16518 O2 Sensor Circ.,
Bank1-Sensor1
No Activity Detected 2
Dcy - Check HO2S -G39- and O2S control (bank 1, sensor1) page
24
-22

P0136 16520 O2 Sensor Circ.,
Bank1-Sensor2
Malfunction 2
Dcy - Check Oxygen Sensor (O2S) behind Three Way Catalytic
Converter (TWC) -G130- (bank 1, sensor 2) page 24
-42

Pa
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01-21

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



P0150 16534 O2 Sensor Circ.,
Bank2-Sensor1
Malfunction 2
Dcy - Check Heated Oxygen Sensor (HO2S) -G108- and Oxygen
Sensor (O2S) control (bank 2, sensor 1) page 24
-22

P0151 16535 O2 Sensor Circ.,
Bank2-Sensor1
Low Voltage
P0152 16536 O2 Sensor Circ.,
Bank2-Sensor1
High Voltage
P0153 16537 O2 Sensor Circ.,
Bank2-Sensor1
Slow Response 2
Dcy - Check HO2S -G108- aging (bank 2, sensor 1) page 24
-63
P0154 16538 O2 Sensor Circ.,
Bank2-Sensor1
No Activity Detected 2
Dcy - Check HO2S -G108- and O2S control (bank 2, sensor 1)
page 24
-22

P0156 16540 O2 Sensor Circ.,
Bank2-Sensor2
Malfunction 2
Dcy - Check O2S 2 behind Three Way Catalytic Converter (TWC) -
G131- (bank 2, sensor 2) page 24
-52

Pa
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)
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01-27

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



P1110 17518 O2 Sensor Heating Circ.,
Bank2-Sensor2
Short to B+ 2
Dcy - Check O2S heater -Z30- (bank 2, sensor 2, behind TWC)
page 24
-52

P1127 17535 Long Term Fuel Trim
mult., Bank1
System too Rich 1) 2
Dcy - Check Mass Air Flow (MAF) sensor -G70- page 24
-68
- Check Heated Oxygen Sensor (HO2S) -G39- (bank 1, sensor
1) and O2S control page 24
-22

- Check Oxygen Sensor (O2S) behind Three Way Catalytic
Converter (TWC) -G130- (bank 1, sensor 2) and O2S control
page 24
-42

- Check fuel pressure, fuel pressure regulator and residual fuel
pressure page 24
-111

- Check fuel injectors page 24
-102
and Output Diagnostic
Test Mode (DTM) page 01
-51

1) The term "mult." = multiplicative; applies to entire engine speed (RPM) and load range.
Pa
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gnostic
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)
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01-28

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 Heated Oxygen Sensor (HO2S) -G39- (bank 1, sensor 1)
and O2S control page 24
-22

- Check Oxygen Sensor (O2S) behind Three Way Catalytic
Converter (TWC) -G130- (bank 1, sensor 2) and O2S control
page 24
-42

- Check fuel pressure, fuel pressure regulator and residual fuel
pressure page 24
-111

- Check fuel injectors page 24
-102
and Output Diagnostic
Test Mode (DTM) page 01
-51

- Check EVAP canister purge regulator valve output Diagnostic
Test Mode (DTM), page 01
-51

1) The term "mult." = multiplicative; applies to entire engine speed (RPM) and load range.
Pa
ge 40 of 97 On Board Dia
gnostic
(OBD
)
11/23/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU03.01.1

01-29

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



P1129 17537 Long Term Fuel Trim
mult., Bank2
System too Rich 1) 2
Dcy - Check Mass Air Flow (MAF) sensor -G70- page 24
-68
- Check Heated Oxygen Sensor (HO2S) 2 -G108- (bank 2, sensor
1) and O2S control page 24
-22

- Check Oxygen Sensor (O2S) 2 behind Three Way Catalytic
Converter (TWC) -G131- (bank 2, sensor 2) and O2S control
page 24
-42

- Check fuel pressure, fuel pressure regulator and residual fuel
pressure page 24
-111

- Check fuel injectors page 24
-102
and Output Diagnostic
Test Mode (DTM) page 01
-51

1) The term "mult." = multiplicative; applies to entire engine speed (RPM) and load range.
Pa
ge 41 of 97 On Board Dia
gnostic
(OBD
)
11/23/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU03.01.1

01-30

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



P1130 17538 Long Term Fuel Trim
mult., Bank2
System too Lean 1) 2
Dcy - Check Heated Oxygen Sensor (HO2S) 2 -G108- (bank 2, sensor
1) and O2S control page 24
-22

- Check Oxygen Sensor (O2S) 2 behind Three Way Catalytic
Converter (TWC) -G131- (bank 2, sensor 2) and O2S control
page 24
-42

- Check fuel pressure, fuel pressure regulator and residual fuel
pressure page 24
-111

- Check fuel injectors page 24
-102
and Output Diagnostic
Test Mode (DTM) page 01
-51

- Check EVAP canister purge regulator valve output Diagnostic
Test Mode (DTM), page 01
-51

1) The term "mult." = multiplicative; applies to entire engine speed (RPM) and load range.
Pa
ge 42 of 97 On Board Dia
gnostic
(OBD
)
11/23/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU03.01.1