1996 AUDI A4 sensor

01-18
Diagnostic Trouble Code (DTC) table

Notes:

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
-134
.
Malfunctions that worsen emissions are also indicated by an exhaust warning lamp (MIL for output DTM) 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.
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 6 of 52 Check DTC Memor
y (function 02
) and Erase DTC Memor
y (function 05
)
11/23/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU05.01.2

01-19

DTC
DTC text
Corrective action
SAE
VAG


P0101 16485 Mass Air Flow (MAF) sensor -G70-
Implausible signal
1) - Check Mass Air Flow (MAF) sensor Page 24
-56
P0102 16486 Mass Air Flow (MAF) sensor -G70-
Signal too small
1)
P0103 16487 Mass Air Flow (MAF) sensor -G70-
Signal too large
1)
P0112 16496 Intake Air Temperature (IAT) sensor -G42-
Signal too small 1) - Intake Air Temperature (IAT) sensor, checking Page 28
-
14

P0113 16497 Intake Air Temperature (IAT) sensor -G42-
Signal too large
1)
P0116 16500 Engine Coolant Temperature (ECT) sensor
-G62-
Implausible signal1) - Engine Coolant Temperature (ECT) sensor, checking
Page 28
-23

P0117 16501 Engine Coolant Temperature (ECT) sensor
-G62-
Signal too small
1)
P0118 16502 Engine Coolant Temperature (ECT) sensor
-G62-
Signal too large
1)
1) For these malfunctions, ECM does not switch on the Malfunction Indicator Lamp (MIL) unless malfunction is recognized
again after another engine start. Meaning of Malfunction Indicator Lamp (MIL) Page 01
-3 .
Pa
ge 8 of 52 Check DTC Memor
y (function 02
) and Erase DTC Memor
y (function 05
)
11/23/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU05.01.2

01-20

DTC
DTC text
Corrective action
SAE
VAG


P0130 16514 Bank 1, sensor 1
Electrical malfunction in
circuit
1) - Testing Oxygen Sensor (O2S) and oxygen sensor control before Three Way
Catalytic Converter (TWC) Page 24
-76

P0131 16515 Bank 1, sensor 1
Voltage too low
1)
P0132 16516 Bank 1, sensor 1
Voltage too high 1)
P0133 16517 Bank1, Sensor 1
Signal too slow
1)
P0134 16518 Bank 1, sensor 1
No activity
1)
1) For these malfunctions, ECM does not switch on the Malfunction Indicator Lamp (MIL) unless malfunction is recognized
again after another engine start. Meaning of Malfunction Indicator Lamp (MIL) Page 01
-3 .
Pa
ge 9 of 52 Check DTC Memor
y (function 02
) and Erase DTC Memor
y (function 05
)
11/23/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU05.01.2

01-21

DTC
DTC text
Corrective action
SAE
VAG


P0136 16520 Bank1, Sensor 2
Electrical malfunction in
circuit
1) - Testing Oxygen Sensor (O2S) and oxygen sensor control behind Three Way
Catalytic Converter (TWC) Page 24
-97

P0137 16521 Bank1, Sensor 2
Voltage too low
1)
P0138 16522 Bank1, Sensor 2
Voltage too high 1)
P0139 16523 Bank1, Sensor 2
Signal too slow
1)
P0140 16524 Bank1, Sensor 2
No activity
1)
1) For these malfunctions, ECM does not switch on the Malfunction Indicator Lamp (MIL) unless malfunction is recognized
again after another engine start. Meaning of Malfunction Indicator Lamp (MIL) Page 01
-3 .
Pa
ge 10 of 52 Check DTC Memor
y (function 02
) and Erase DTC Memor
y (function 05
)
11/23/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU05.01.2

01-22

DTC
DTC text
Corrective action
SAE
VAG


P0150 16534 Bank 2, sensor 1
Electrical malfunction in
circuit
1) - Testing Oxygen Sensor (O2S) and oxygen sensor control before Three Way
Catalytic Converter (TWC) Page 24
-76

P0151 16535 Bank 2, sensor 1
Voltage too low
1)
P0152 16536 Bank 2, sensor 1
Voltage too high 1)
P0153 16537 Bank 2, sensor 1
Signal too slow
1)
P0154 16538 Bank 2, sensor 1
No activity
1)
1) For these malfunctions, ECM does not switch on the Malfunction Indicator Lamp (MIL) unless malfunction is recognized
again after another engine start. Meaning of Malfunction Indicator Lamp (MIL) Page 01
-3 .
Pa
ge 11 of 52 Check DTC Memor
y (function 02
) and Erase DTC Memor
y (function 05
)
11/23/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU05.01.2

01-23

DTC
DTC text
Corrective action
SAE
VAG


P0156 16540 Bank 2, sensor 2
Electrical malfunction in
circuit
1) - Testing Oxygen Sensor (O2S) and oxygen sensor control behind Three Way
Catalytic Converter (TWC) Page 24
-97

P0157 16541 Bank 2, sensor 2
Voltage too low
1)
P0158 16542 Bank 2, sensor 2
Voltage too high 1)
P0159 16543 Bank 2, sensor 2
Signal too slow
1)
P0160 16544 Bank 2, sensor 2
No activity
1)
P0219 16603 Maximum engine speed
exceeded - Repair mechanical damage
1) For these malfunctions, ECM does not switch on the Malfunction Indicator Lamp (MIL) unless malfunction is recognized
again after another engine start. Meaning of Malfunction Indicator Lamp (MIL) Page 01
-3 .
Pa
ge 12 of 52 Check DTC Memor
y (function 02
) and Erase DTC Memor
y (function 05
)
11/23/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU05.01.2

01-25

DTC
DTC text
Corrective action
SAE
VAG


P0321 16705 Engine Speed (RPM) sensor -G28-
Implausible signal
1) - Check sender for fuel gauge Page 28
-19
P0322 16706 Engine Speed (RPM) sensor -G28-
No signal
1)
P0327 16711 Knock Sensor (KS) 1 -G61-
Signal too small - Check knock sensor Page 28
-41
P0328 16712 Knock Sensor (KS) 1 -G61-
Signal too large
P0332 16716 Knock Sensor (KS) 2 -G66-
Signal too small
P0333 16717 Knock Sensor (KS) 2 -G66-
Signal too large
P0341 16725 Camshaft Position (CMP) sensor -G40-
Implausible signal
1)
- Check Camshaft Position (CMP) sensor Page 28
-45
P0346 16730 Camshaft Position (CMP) sensor -G163-

Implausible signal
1)

1) For these malfunctions, ECM does not switch on the Malfunction Indicator Lamp (MIL) unless malfunction is recognized
again after another engine start. Meaning of Malfunction Indicator Lamp (MIL) Page 01
-3 .
Pa
ge 14 of 52 Check DTC Memor
y (function 02
) and Erase DTC Memor
y (function 05
)
11/23/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU05.01.2

01-26

DTC
DTC text
Corrective action
SAE
VAG


P0420 16804 Catalytic converter
system, bank 1,
Not effective enough
1)
Repair Manual, Engine Mechanical, Repair Group 26; Exhaust system
components, removing and installing - Generate readiness code Page 01
-82
. If the same malfunction is indicated
again, replace primary catalytic converter, bank 1.
P0421 16805 Primary catalytic
converter, bank 1,
Not effective enough
1)
Repair Manual, Engine Mechanical, Repair Group 26; Exhaust system
components, removing and installing - Generate readiness code Page 01
-82
. If the same malfunction is indicated
again, replace primary catalytic converter, bank 1.
1) For these malfunctions, ECM does not switch on the Malfunction Indicator Lamp (MIL) unless malfunction is recognized
again after another engine start. Meaning of Malfunction Indicator Lamp (MIL) Page 01
-3 .
Important note:
The primary catalytic converters are located between the oxygen sensors of the appropriate cylinder bank. They are not
immediately visible after vehicle is raised; they are the two, slightly smaller catalytic converters located closer to the engine.
Pa
ge 15 of 52 Check DTC Memor
y (function 02
) and Erase DTC Memor
y (function 05
)
11/23/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU05.01.2