1999 AUDI A4 check engine light

01-23

DTC
Description of
malfunction
Corrective action
SAE
VAG


P0136 16520 02 Sensor Circ., Bank1-
Sensor2
Malfunction
2) - Check oxygen sensor heater Page 24
-114
P0137 16521 02 Sensor Circ., Bank1-
Sensor2
Low Voltage
2) - Check oxygen sensor signal wire and activation Page 24
-122
P0138 16522 02 Sensor Circ., Bank1-
Sensor2
High Voltage
2)
P0139 16523 02 Sensor Circ., Bank1-
Sensor2
Slow Response2) - Check oxygen sensor and oxygen sensor control behind catalytic
converter Page 24
-100

P0140 16524 02 Sensor Circ., Bank1-
Sensor2
No Activity Detected
2)
2) With this malfunction the exhaust Malfunction Indicator Light (MIL) is only switched on by the ECM, if the malfunction is
recognized after the engine has been restarted. Significance of MIL Page 01
-3 .
Pa
ge 27 of 166 Motronic s
ystem, On Board Dia
gnostic
(OBD
)
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU04.01.1

01-24

DTC
Description of malfunction
Corrective action
SAE
VAG


P0150 16534 02 Sensor Circ., Bank2-
Sensor1
Malfunction
2) - Check oxygen sensor control or oxygen sensor heater and wiring
Page 24
-79

P0151 16535 02 Sensor Circ., Bank2-
Sensor1
Low voltage
2)
P0152 16536 02 Sensor Circ., Bank2-
Sensor1
High Voltage 2)
P0153 16537 02 Sensor Circ., Bank2-
Sensor1
Slow Response 2)
P0154 16538 02 Sensor Circ., Bank2-
Sensor1
No Activity Detected
2)
2) With this malfunction the exhaust Malfunction Indicator Light (MIL) is only switched on by the ECM, if the malfunction is
recognized after the engine has been restarted. Significance of MIL Page 01
-3 .
Pa
ge 28 of 166 Motronic s
ystem, On Board Dia
gnostic
(OBD
)
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU04.01.1

01-25

DTC
Description of
malfunction
Corrective action
SAE
VAG


P0156 16540 02 Sensor Circ., Bank2-
Sensor2
Malfunction
2) - Check oxygen sensor heater Page 24
-114
P0157 16541 02 Sensor Circ., Bank2-
Sensor2
Low Voltage
2) - Check oxygen sensor signal wire and activation Page 24
-122
P0158 16542 02 Sensor Circ., Bank2-
Sensor2
High Voltage
2)
P0159 16543 02 Sensor Circ., Bank2-
Sensor2
Slow Response 2) - Check oxygen sensor and oxygen sensor control behind catalytic
converter Page 24
-100

P0160 16544 02 Sensor Circ., Bank2-
Sensor2
No Activity Detected
2) - Check oxygen sensor heater Page 24
-114
2) With this malfunction the exhaust Malfunction Indicator Light (MIL) is only switched on by the ECM, if the malfunction is
recognized after the engine has been restarted. Significance of MIL Page 01
-3 .
Pa
ge 29 of 166 Motronic s
ystem, On Board Dia
gnostic
(OBD
)
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU04.01.1

01-26

DTC
Description of
malfunction
Corrective action
SAE
VAG


P0236 16620 Charge air pressure
sensor -G31-
Implausible signal Repair Manual, 2.7 Liter V6 5V BiTurbo Engine Mechanical, Engine Code(s):
APB, Repair Group 21; Boost pressure system with turbocharger; charge air pressure sensor
-G31
-, checking

P0237 16621 Turbocharger Boost
Sensor (A) Circ
Low Input
2) Repair Manual, 2.7 Liter V6 5V BiTurbo Engine Mechanical, Repair Group 21;
Turbocharger; Checking Charge Air Pressure Sensor -G31
P0238 16622 Turbocharger Boost
Sensor (A) Circ
High Input
2)
2) With this malfunction the exhaust Malfunction Indicator Light (MIL) is only switched on by the ECM, if the malfunction is
recognized after the engine has been restarted. Significance of MIL Page 01
-3 .
Pa
ge 30 of 166 Motronic s
ystem, On Board Dia
gnostic
(OBD
)
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU04.01.1

01-27

DTC
Description of malfunction
Corrective action
SAE
VAG


P0300 16684 Random/Multiple Cylinder
Misfire Detected
2) - Check cause for misfire Page 28
-52
P0301 16685
Cyl.1 Misfire Detected
2)
- Check fuel tank level
P0302 16686
Cyl.2 Misfire Detected 2)

P0303 16687
Cyl.3 Misfire Detected 2)

P0304 16688
Cyl.4 Misfire Detected 2)

P0305 16689
Cyl.5 Misfire Detected 2)

P0306 16690
Cyl.6 Misfire Detected 2)

2) With this malfunction the exhaust Malfunction Indicator Light (MIL) is only switched on by the ECM, if the malfunction is
recognized after the engine has been restarted. Significance of MIL Page 01
-3 .
The Malfunction Indicator Light (MIL) will blink if the Engine Control Module (ECM) recognizes misfire that could damage the
catalytic converters.
Notes:

On malfunction which could be caused by lack of fuel (e.g.: misfire) the malfunction P1250 "Fuel level too low" will be
displayed in addition. That means, the misfiring was detected due to lack of fuel in the tank and not due to a technical
malfunction.
Pa
ge 31 of 166 Motronic s
ystem, On Board Dia
gnostic
(OBD
)
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU04.01.1

01-30

DTC
Description of
malfunction
Corrective action
P0441 16825 EVAP Emission Contr.
Sys. Incorrect
Purge Flow
2) - Check EVAP canister purge regulator valve, perform output Diagnostic Test
Mode (DTM) Page 01
-75

P0442 16826 EVAP Emission Contr.
Sys. (Small Leak)
Leak Detected
2) - Check EVAP system and tank system for leaks
P0455 16839 EVAP Emission Contr.
Sys. (Gross Leak)
Leak Detected Repair Manual, Fuel Supply System, Repair Group 20, Components of EVAP
system servicing, carry out tank leak test

P0456 16840 Tank ventilation system
Pin-hole leak detected
Repair Manual, 2.7 Liter V6 5V BiTurbo Engine Mechanical, Repair Group 20;
Fuel supply, gas engine; EVAP canister system components, servicing; tank leak diagnostic, performing.
- Checking fuel supply and ventilation systems for leaks
2) With this malfunction the exhaust Malfunction Indicator Light (MIL) is only switched on by the ECM, if the malfunction is
recognized after the engine has been restarted. Significance of MIL Page 01
-3 .
Pa
ge 36 of 166 Motronic s
ystem, On Board Dia
gnostic
(OBD
)
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU04.01.1

01-32

DTC
Description of malfunction
Corrective action
SAE
VAG


P0601 16985 Internal Contr. Module Memory
Check Sum Error
2) - Replace Engine Control
Module (ECM) Page 24
-24
P0604 16988 Internal Contr. Module Random Access
Memory (RAM) Error
2)
P0605 16989
Internal Contr. Module ROM Test Error
2)

P0606 16990 Control module faulty
- Replace Engine Control Module (ECM) Page 24
-24
2) With this malfunction the exhaust Malfunction Indicator Light (MIL) is only switched on by the ECM, if the malfunction is
recognized after the engine has been restarted. Significance of MIL Page 01
-3 .
Pa
ge 39 of 166 Motronic s
ystem, On Board Dia
gnostic
(OBD
)
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU04.01.1

01-33

DTC
Description of malfunction
Corrective action
SAE
VAG


P1102 17510 O2 Sensor Heating Circ., Bank1-
Sensor1
Short to B+
2) - Check oxygen sensor heater Page 24
-114
P1105 17513 O2 Sensor Heating Circ., Bank1-
Sensor2
Short to B+
2)
P1107 17515 O2 Sensor Heating Circ., Bank2-
Sensor1
Short to B+ 2)
P1110 17518 O2 Sensor Heating Circ., Bank2-
Sensor2
Short to B+ 2)
P1111 17519 O2 Control (Bank 1)
System too lean - Check oxygen sensor adaptation values and oxygen sensor control
Page 24
-86

P1112 17520 O2 Bank 1
System too rich
2) With this malfunction the exhaust Malfunction Indicator Light (MIL) is only switched on by the ECM, if the malfunction is
recognized after the engine has been restarted. Significance of MIL Page 01
-3 .
Pa
ge 40 of 166 Motronic s
ystem, On Board Dia
gnostic
(OBD
)
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU04.01.1