check engine light AUDI A4 1997 B5 / 1.G AFC Engine On Board Diagnostic Multiport Fuel Injection User Guide

01-32

Output on GST and/or
on VAG 1551 scan tool
Possible malfunction cause

Malfunction repair
P0120 / 16504
Throttle Position Sensor
A Circuit Malfunction Harness connector on Throttle Position
(TP) sensor -G69- loose or corroded due to
moisture in the harness connector

- Check harness connector for tight fit and
contact corrosion, if necessary reconnect
and/or clean

Malfunction cause found: Yes
No

- Erase DTC memory, test drive and check
DTC memory again
MIL Status:
MIL lights up
immediately Closed Throttle Position (CTP) switch -
F60- in throttle position sensor does not
open or is faulty

- Check and adjust Closed Throttle Position
(CTP) switch -F60- page 24
-73

Note:
The malfunction P1506 /
17914 is also stored Malfunction cause found: Yes
No

- Erase DTC memory, test drive and check
DTC memory again
For troubleshooting
Display group 002
Engine Control Module (ECM) -J192-
faulty

- Replace and code engine control module
page 01
-265
erase DTC memory and
test drive check DTC memory
Notes:
The malfunction "P0120 / 16504" is set, with idle switch closed, as soon as a position sensor signal voltage of over 0.72 volts
is recognized for longer than 2 sec. (corresponds to a throttle opening of more than 7 ).
Pa
ge 44 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

01-33

Output on GST and/or on
VAG 1551 scan tool Possible malfunction cause

Malfunction repair
P0121 / 16505
Throttle Position Sensor A
Circuit Range/ Performance
Problem Harness connector on Throttle Position
(TP) sensor -G69- loose or corroded due to
moisture in the harness connector

- Check harness connector for tight fit
and contact corrosion, if necessary
reconnect and/or clean

Malfunction cause found: Yes
No

- Erase DTC memory, test drive and
check DTC memory again
MIL Status:
MIL lights up immediately Harness connector on Mass Air Flow
(MAF) sensor -G70- loose or corroded due to
moisture in the harness connector

- Check harness connector for tight fit
and contact corrosion, if necessary
reconnect and/or clean

Malfunction cause found: Yes
No

- Erase DTC memory, test drive and
check DTC memory again
For troubleshooting Display
group 002
Throttle Position (TP) sensor -G69- loose,
incorrectly adjusted or shaft connection
eccentric

- Check and adjust throttle position
sensor -G69- page 24
-77

Notes:
The malfunction "P0121 / 16505" is set at a coolant temperature of over 70 C (158 F), engine speed between 1500 RPM
and 3500 RPM for longer than 2 seconds and an engine load over 66% (Mass Air Flow sensor signal) as soon as the sensor
signal voltage is less than 0.96 volts (corresponds to a throttle opening less than 12 ).
Pa
ge 45 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

01-34

Output on GST and/or
on VAG 1551 scan tool
Possible malfunction cause

Malfunction repair
P0122 / 16506
Throttle Position Sensor
A Circuit Low Input Harness connector on Throttle Position
(TP) sensor -G69- loose or corroded due to
moisture in the harness connector

- Check harness connector for tight fit and
contact corrosion, if necessary reconnect
and/or clean

Malfunction cause found: Yes
No

- Erase DTC memory, test drive and check
DTC memory again
MIL Status:
MIL lights up
immediately
Wiring connection to Throttle Position
(TP) sensor -G69- faulty, or sensor -G69-
faulty

- Check throttle position sensor -G69-
page 24
-77


Malfunction cause found: Yes
No

- Erase DTC memory, test drive and check
DTC memory again
For troubleshooting
Display group 002
Engine Control Module (ECM) -J192-
faulty

- Replace and code engine control module
page 01
-265
erase DTC memory and
test drive check DTC memory
Notes:
The malfunction "P0122 / 16506" is set as soon as the signal voltage is less than 0.1 volts for longer than 2 sec at an engine
speed of over 6000 RPM.
Pa
ge 46 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

01-35

Output on GST and/or
on VAG 1551 scan tool
Possible malfunction cause

Malfunction repair
P0123 / 16507
Throttle Position Sensor
A Circuit High Input Harness connector on Throttle Position
(TP) sensor -G69- loose or corroded due to
moisture in the harness connector

- Check harness connector for tight fit and
contact corrosion, if necessary reconnect
and/or clean

Malfunction cause found: Yes
No

- Erase DTC memory, test drive and check
DTC memory again
MIL Status:
MIL lights up
immediately
Wiring connection to Throttle Position
(TP) sensor -G69- faulty, or sensor -G69-
faulty

- Check throttle position sensor -G69-
page 24
-77


Malfunction cause found: Yes
No

- Erase DTC memory, test drive and check
DTC memory again
For troubleshooting
Display group 002
Engine Control Module (ECM) -J192-
faulty

- Replace and code engine control module
page 01
-265
erase DTC memory and
test drive check DTC memory
Notes:
The malfunction "P0123 / 16507" is set as soon as the signal voltage is greater than 4.9 volts for longer than 2 sec.
Pa
ge 47 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

01-36

Output on GST and/or
on VAG 1551 scan tool
Possible malfunction cause

Malfunction repair
P0130 / 16514
O2 Sensor Circuit
Malfunction (Bank 1
Sensor 1) Wiring conection to Heated Oxygen
Sensor (HO2S) -G39- (B1-S1) loose or
corroded due to moisture in the harness
connector

- Check harness connector for tight fit and
contact corrosion, if necessary reconnect
and/or clean, installation location page 24
-1

Malfunction cause found: Yes
No

- Erase DTC memory, test drive and check
DTC memory again
MIL Status:
MIL lights up
immediately Wiring conection to Heated Oxygen
Sensor (HO2S) -G39- (B1-S1) faulty, or
HO2S -G39- faulty

- Check HO2S -G39- (B1-S1) page 24
-49

Malfunction cause found: Yes
No

- Erase DTC memory, test drive and check
DTC memory again
For troubleshooting
Display group 010
Engine Control Module (ECM) -J192-
faulty

- Replace and code engine control module
page 01
-265
erase DTC memory and
test drive check DTC memory
Note:
The malfunction "P0130 / 16514" is set as soon as the difference between minimum and maximum signal voltage is less than
500 mV at an engine temperature over 80 C (176 F), 60 sec after start of control.
Pa
ge 48 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

01-37

Output on GST and/or
on VAG 1551 scan tool
Possible malfunction cause

Malfunction repair
P0132 / 16516
O2 Sensor Circuit High
Voltage (Bank 1 Sensor
1) Harness connector for Heated Oxygen
Sensor (HO2S) -G39- (B1-S1) loose or
corroded due to moisture in the harness
connector

- Check harness connector for tight fit and
contact corrosion, if necessary reconnect
and/or clean, installation location page 24
-1

Malfunction cause found: Yes
No

- Erase DTC memory, test drive and check
DTC memory again
MIL Status:
MIL lights up
immediately
Wiring conection to Heated Oxygen
Sensor (HO2S) -G39- (B1-S1) faulty, or
HO2S -G39- faulty

- Check HO2S -G39- (B1-S1) page 24
-
49


Malfunction cause found: Yes
No

- Erase DTC memory, test drive and check
DTC memory again
For troubleshooting
Display group 010
Engine Control Module (ECM) -J192-
faulty

- Replace and code engine control module
page 01
-265
erase DTC memory and
test drive check DTC memory
Notes:
The malfunction "P0132 / 16516" is set as soon as the HO2S voltage is greater than 1.4 volts for longer than 5 sec., 123 sec.
Pa
ge 49 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

01-38

Output on GST and/or on
VAG 1551 scan tool Possible malfunction cause

Malfunction repair
P0133 / 16517
O2 Sensor Circuit Slow
Response (Bank 1 Sensor
1) Harness connector for Heated Oxygen
Sensor (HO2S) -G39- (B1-S1) loose or
corroded due to moisture in the harness
connector

- Check harness connector for tight fit
and contact corrosion, if necessary
reconnect and/or clean, installation
location page 24
-1

Malfunction cause found: Yes
No

- Erase DTC memory, test drive and
check DTC memory again
MIL Status:
MIL lights up after 2 Trips Heated Oxygen Sensor (HO2S) -G39-
(B1-S1) faulty

- Replace HO2S -G39- (B1-S1) and code
engine control module page 24
-57


Malfunction cause found: Yes
No

- Erase DTC memory, test drive and
check DTC memory again
For troubleshooting
Display groups 032, 033,
034, 041, 042, 043
Has the malfunction occurred again
within a short time after the Oxygen
Sensor Probe was replaced?


- Very poor fuel quality can possibly
cause the malfunction "P0133 / 16517".
Extract old fuel and fill vehicle with
premium.

Malfunction cause found: Yes

- Erase DTC memory, test drive and
check DTC memory again
Notes:
The malfunction "P0133 / 16517" is set as soon as the flank rise time (limit value 90 ms) and/or flank drop time (limit value
100 ms) of the probe signal has been exceeded between 300 mV and 500 mV.
Pa
ge 51 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

01-39

Output on GST and/or
on VAG 1551 scan tool Possible malfunction cause

Malfunction repair
P0134 / 16518
O2 Sensor Circuit No
Activity Detected (Bank 1
Sensor 1) Harness connector for Heated Oxygen
Sensor (HO2S) -G39- (B1-S1) loose or
corroded due to moisture in the harness
connector

- Check harness connector for tight fit and
contact corrosion, if necessary reconnect
and/or clean, installation location page 24
-1

Malfunction cause found: Yes
No

- Erase DTC memory, test drive and check
DTC memory again
MIL Status:
MIL lights up immediately Wiring conection to Heated Oxygen
Sensor (HO2S) -G39- (B1-S1) faulty, or
HO2S -G39- faulty

- Check HO2S -G39- (B1-S1) page 24
-
49


Malfunction cause found: Yes
No

- Erase DTC memory, test drive and check
DTC memory again
For troubleshooting
Display group 010
Engine Control Module (ECM) -J192-
faulty

- Replace and code engine control module
page 01
-265
erase DTC memory and
test drive check DTC memory
Note:
The malfunction "P0134 / 16518" is set as soon as the signal voltage is between 370 mV and 430 mV for longer than 4 sec,
123 sec after engine start and engine temperature over 30 C (86 F).
Pa
ge 52 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

01-40

Output on GST and/or
on VAG 1551 scan tool Possible malfunction cause

Malfunction repair
P0135 / 16519
O2 Sensor Heater Circuit
Malfunction (Bank 1
Sensor 1) Harness connector for Oxygen Sensor
(O2S) heater -Z19- (B1-S1) loose or
corroded due to moisture in the harness
connector

- Check harness connector for tight fit and
contact corrosion, if necessary reconnect
and/or clean, installation location page 24
-1

Malfunction cause found: Yes
No

- Erase DTC memory, test drive and check
DTC memory again
MIL Status:
MIL lights up immediately
Wiring connection for Oxygen Sensor
(O2S) heater -Z19- (B1-S1) faulty, or heater
-Z19- faulty

- Check O2S heater -Z19- (B1-S1) page 24
-51


Malfunction cause found: Yes
No

- Erase DTC memory, test drive and check
DTC memory again
For troubleshooting
Display group 040
Engine Control Module (ECM) -J192-
faulty

- Replace and code engine control module
page 01
-265
erase DTC memory and
test drive check DTC memory
Notes:

The heating of the O2S in front of the Three Way Catalytic Converter (TWC) are switched on by the fuel pump relay.
Pa
ge 53 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

01-41

Output on GST and/or
on VAG 1551 scan
tool Possible malfunction cause

Malfunction repair
P0136 / 16520
O2 Sensor Circuit
Malfunction (Bank 1
Sensor 2) Harness connector for Oxygen Sensor (O2S)
behind Three Way Catalytic Converter (TWC) -
G130- (B1-S2) loose or corroded due to moisture
in the harness connector

- Check harness connector for tight fit
and contact corrosion, if necessary
reconnect and/or clean, installation
location page 24
-1

Malfunction cause found: Yes
No

- Erase DTC memory, test drive and
check DTC memory again
MIL Status:
MIL lights up
immediately Wiring connection to Oxygen Sensor (O2S)
behind Three Way Catalytic Converter (TWC) -
G130- (B1-S2) faulty, or sensor -G130- faulty

- Check O2S behind three way catalytic
converter -G130- (B1-S2) page 24
-
53


Malfunction cause found: Yes
No

- Erase DTC memory, test drive and
check DTC memory again
For troubleshooting
Display group 041
Engine Control Module (ECM) -J192- faulty

- Replace and code engine control
module page 01
-265
erase DTC
memory and test drive check DTC
memory
Notes:
Pa
ge 55 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