1998 AUDI A4 heater

01-17

Diagnostic Trouble Code (DTC)
Malfunction text
MIL switching condition
SAE
VAG
P0122 16506 Throttle Position Sensor A Circuit Low Input immediately
P0123 16507 Throttle Position Sensor A Circuit High Input immediately
P0130 16514 O2 Sensor Circuit Malfunction (Bank 1 Sensor 1) immediately
P0132 16516 O2 Sensor Circuit High Voltage (Bank 1 Sensor 1) immediately
P0133 16517 O2 Sensor Circuit Slow Response (Bank 1 Sensor 1) 2 Trips
P0134 16518 O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1) immediately
P0135 16519 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1) immediately
P0136 16520 O2 Sensor Circuit Malfunction (Bank 1 Sensor 2) immediately
P0138 16522 O2 Sensor Circuit High Voltage (Bank 1 Sensor 2) immediately
P0141 16525 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2) immediately
P0150 16534 O2 Sensor Circuit Malfunction (Bank 2 Sensor 1) immediately
P0152 16536 O2 Sensor Circuit High Voltage (Bank 2 Sensor 1) immediately
P0153 16537 O2 Sensor Circuit Slow Response (Bank 2 Sensor 1) 2 Trips
P0154 16538 O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 1) immediately
P0155 16539 O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1) immediately
P0156 16540 O2 Sensor Circuit Malfunction (Bank 2 Sensor 2) immediately
Pa
ge 28 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

01-18

Diagnostic Trouble Code (DTC)
Malfunction text
MIL switching condition
SAE
VAG
P0158 16542 O2 Sensor Circuit High Voltage (Bank 2 Sensor 2) immediately
P0161 16545 O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 2) immediately
P0170 16554 Fuel Trim Malfunction (Bank 1) 2 Trips
P0171 16555 System too Lean (Bank 1) 2 Trips
P0172 16556 System too Rich (Bank 1) 2 Trips
P0173 16557 Fuel Trim Malfunction (Bank 2) 2 Trips
P0174 16558 System too Lean (Bank 2) 2 Trips
P0175 16559 System too Rich (Bank 2) 2 Trips
P0300 16684 Random Misfire Detected 2 Trips / blink
P0301 16685 Cylinder 1 Misfire Detected 2 Trips / blink
P0302 16686 Cylinder 2 Misfire Detected 2 Trips / blink
P0303 16687 Cylinder 3 Misfire Detected 2 Trips / blink
P0304 16688 Cylinder 4 Misfire Detected 2 Trips / blink
P0305 16689 Cylinder 5 Misfire Detected 2 Trips / blink
P0306 16690 Cylinder 6 Misfire Detected 2 Trips / blink
Pa
ge 29 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

01-43

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

Malfunction repair
P0141 / 16525
O2 Sensor Heater Circuit
Malfunction (Bank 1
Sensor 2) Harness connector for Oxygen Sensor
(O2S) heater -Z29- (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 for Oxygen Sensor
(O2S) heater -Z29- (B1-S2) faulty, or heater
-Z29- faulty

- Check O2S heater -Z29- (B1-S2) page 24
-55


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 heater for the O2S behind the Three Way Catalytic Converter (TWC) is not switched on immediately at engine start, but
only when the calculated exhaust gas temperature exceeds 308 C (586 F)( Read measuring value block, display group
42, channel 1).
Pa
ge 59 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

01-48

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

Malfunction repair
P0155 / 16539
O2 Sensor Heater Circuit
Malfunction (Bank 2
Sensor 1) Harness connector for Oxygen Sensor
(O2S) heater -Z28- (B2-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 -Z28- (B2-S1) faulty, or heater
-Z28- faulty

- Check O2S heater -Z28- (B2-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 heater for the O2S in front of the Three Way Catalytic Converter (TWC) is switched on by the fuel pump relay.
Pa
ge 64 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

after the probe heater behind the Three Way Catalytic Converter (TWC) is switched on , as soon as the signal voltage during
a deceleration fuel shut off is greater than 300 mV. The length of the deceleration fuel shut off must be longer than 4 sec.
Pa
ge 66 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

01-51

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

Malfunction repair
P0161 / 16545
O2 Sensor Heater Circuit
Malfunction (Bank 2
Sensor 2) Harness connector for Oxygen Sensor
(O2S) heater -Z30- (B2-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 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 -Z30- (B2-S2) or heater -Z30-
(B2-S2) faulty

- Check O2S heater -Z30- (B2-S2)
page 24
-55


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 heater for O2S behind Three Way Catalytic Converter (TWC) is not switched on immediately at engine start, but only
when the calculated exhaust gas temperature exceeds 308 C (586 F) ( Read measuring value block, display group 42,
channel 1).
Pa
ge 69 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

01-92

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

Malfunction repair
P1102 / 17510
Heating Circ. (B1-S1)
Short to B+ 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 after
test drive, check DTC memory again
MIL Status:
MIL lights up
immediately
Wiring connection of 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 after
test drive, 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 oxygen sensor probes in front of Three Way Catalytic Converter (TWC) is switched on with the fuel
pump relay, i.e. immediately at engine start.
Pa
ge 123 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