1999 AUDI A4 engine

01-19
Diagnostic Trouble Code (DTC) table Note:

When malfunctions occur in monitored sensors or components, Diagnostic Trouble Codes (DTCs) are stored in DTC
memory with a description of the malfunction type.
"E-Gas"-relevant malfunctions are also indicated in the instrument cluster by the warning lamp for Electronic Power
Control ("EPC warning lamp"); Notes for E-gas system Page 24
-113
.
Malfunctions that worsen emissions are also indicated by an exhaust warning lamp (MIL) that is also located in the
instrument cluster. There are malfunctions that cause the exhaust warning lamp to light up immediately after recognition.
Malfunctions can also occur that do not cause the exhaust MIL to light up immediately, but only if malfunction is
recognized again after repeated engine starts. Meaning of exhaust MIL Page 01
-3 .
The DTC table is organized by the 5 digit code at left.
If a stored DTC does not recur within the next 40 warm-up cycles, the DTC will be erased automatically.
Malfunctions that occur only sporadically (temporary malfunctions) are are identified by the letters "SP" (sporadic
malfunction) on the VAG1551 scan tool display. The word sporadic means "appearing or occurring at irregular intervals,
occasional".
Do not immediately replace components that the VAG1551/VAS5051 suggests are faulty, instead: Check wire
connections and harness connectors to these components according to wiring diagram. Also check Ground (GND)
connections according to wiring diagram. This is particularly valid when malfunctions are displayed as "sporadically
occurring" (SP).
Pa
ge 1 of 40 Dia
gnostic Trouble Code
(DTC
) table
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU06.01.3

If the connector is disconnected from the ECM or the battery is disconnected, all adaptation values in the control module
are erased. DTC memory content will remain intact however. If the engine is started after this, a rough, uneven idle can
result. In this case, engine must be allowed to run at idle for a few minutes until adaptation procedure has been
completed.
If DTC memory was erased Page 01
-16
, readiness code must be re-generated Page 01
-73
.
Pa
ge 2 of 40 Dia
gnostic Trouble Code
(DTC
) table
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU06.01.3

01-20
DTC codes 16485 - 17624

DTC
DTC text
Corrective action
SAE
VAG


P0101 16485 Mass Air Flow (MAF)
sensor -G70-
Implausible signal - Check Mass Air Flow (MAF) sensor Page 24
-60
P0102 16486 Mass Air Flow (MAF)
sensor -G70-
Signal too small
P0103 16487 Mass Air Flow (MAF)
sensor -G70-
Signal too large
P0106 16490 MAP sensor -G71-/BARO
sensor -F96-
Implausible signal
1) Repair Manual, 1.8 Liter 4
-Cyl. 5V Turbo Engine Mechanical, Engine Code
(s): AEB, ATW, Repair Group 21, Charge air system with turbocharger, checking

P0112 16496 Intake Air Temperature
(IAT) sensor -G42-
Signal too small - Intake Air Temperature (IAT) sensor, checking Page 28
-21
P0113 16497 Intake Air Temperature
(IAT) sensor -G42-
Signal too large
Pa
ge 3 of 40 Dia
gnostic Trouble Code
(DTC
) table
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU06.01.3

01-21

DTC
DTC text
Corrective action
SAE
VAG


P0116 16500 Engine Coolant Temperature
(ECT) sensor -G62-
Implausible signal - Engine Coolant Temperature (ECT) sensor, checking Page 28
-30
P0117 16501 Engine Coolant Temperature
(ECT) sensor -G62-
Signal too small
P0118 16502 Engine Coolant Temperature
(ECT) sensor -G62-
Signal too large
P0130 16514 Bank 1, sensor 1
Electrical malfunction in circuit - Check Oxygen Sensor (O2S) and oxygen sensor control before
Three Way Catalytic Converter (TWC) Page 24
-71

P0131 16515 Bank 1, sensor 1
Voltage too low
P0132 16516 Bank 1, sensor 1
Voltage too high
P0133 16517 Bank1, Sensor 1
Signal too slow
P0134 16518 Bank 1, sensor 1
Pa
ge 5 of 40 Dia
gnostic Trouble Code
(DTC
) table
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU06.01.3

01-22

DTC
DTC text
Corrective action
SAE
VAG


P0136 16520 Bank 2, sensor 1
Electrical malfunction
in circuit - Check Oxygen Sensor (O2S) and oxygen sensor control behind Three Way
Catalytic Converter (TWC) Page 24
-87

P0137 16521 Bank1, Sensor 2
Voltage too low
P0138 16522 Bank1, Sensor 2
Voltage too high
P0139 16523 Bank1, Sensor 2
Signal too slow
P0140 16524 Bank1, Sensor 2No
activity
P0236 16620 Charge air pressure
sensor -G31-
Implausible signal Repair Manual, 1.8 Liter 4
-Cyl. 5V Turbo Engine Mechanical, Engine Code(s):
AEB, ATW, Repair Group 21, Charge air system with turbocharger, checking

P0237 16621 Charge air pressure
sensor -G31-
Signal too small
P0238 16622 Charge air pressure
sensor -G31-
Pa
ge 7 of 40 Dia
gnostic Trouble Code
(DTC
) table
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU06.01.3

01-23

DTC
DTC text
Corrective action
SAE
VAG


P0300 16684 Combustion misfire detected
- Check fuel pressure Page 24
-33
- Check fuel injectors Page 24
-38
P0301 16685 Cyl. 1 combustion misfire detected
- Check spark plugs and ignition wires with connector
P0302 16686 Cyl. 2 combustion misfire detected
- Ignition coils with power output stages Checking Page 28
-4
P0303 16687 Cyl. 3 combustion misfire detected
- Check misfire recognition Page 28
-51
P0304 16688 Cyl. 4 combustion misfire detected
- Fill fuel tank with fuel
P0321 16705 Engine Speed (RPM) sensor -G28-
Implausible signal - Check sender for fuel gauge Page 28
-26
P0322 16706 Engine Speed (RPM) sensor -G28-
No signal
Pa
ge 9 of 40 Dia
gnostic Trouble Code
(DTC
) table
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU06.01.3

01-25

DTC
DTC text
Corrective action
SAE
VAG


P0411 16795 Secondary air system
Throughput faulty
Repair Manual, 1.8 Liter 4
-Cyl. 5V Turbo Engine Mechanical, Engine Code(s):
AEB, ATW, Repair Group 26; Checking Secondary Air Injection (AIR) system
- Check combination valve.
- Check hose setup (Secondary Air Injection -AIR- solenoid valve); check intake
system for leaks (false air) Page 24
-68

P0422 16806 Bank 1, main catalytic
converter
Not effective enough
Repair Manual, 1.8 Liter 4
-Cyl. 5V Turbo Engine Mechanical, Engine 1.8 Liter
4-Cyl. 5V Turbo Engine Mechanical, Engine Code(s): AEB, ATW, Repair Group
26
- Generate readiness code Page 01
-73
. If the same malfunction is indicated
again, replace catalytic converter.
P0441 16825 Tank ventilation system
Throughput faulty - Check Evaporative Emission (EVAP) canister purge regulator valve Page
24
-107

Pa
ge 11 of 40 Dia
gnostic Trouble Code
(DTC
) table
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU06.01.3

01-28

DTC
DTC text
Corrective action
SAE
VAG


P0601 16985 Control module faulty
- Replacing Engine Control Module (ECM) Page 24
-23
P0604 16988 Control module faulty
P0605 16989 Control module faulty
P0685 17069 Main relay -J271-
Open circuit - Check motronic Engine Control Module (ECM) power supply relay -J271-
Page 28
-13

P1102 17510 Bank 1, sensor 1, heating
circuit
Short circuit to B+ - Check oxygen sensor heating Page 24
-99
P1105 17513 Bank 1, sensor 2, heating
circuit
Short circuit to B+
P1111 17519 Oxygen sensor control,
bank 1
System too lean - Check oxygen sensor control behind catalytic converter Page 24
-71
P1112 17520 Oxygen sensor control,
bank 1
System too rich
Pa
ge 14 of 40 Dia
gnostic Trouble Code
(DTC
) table
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU06.01.3