1997 AUDI A4 check engine

01-12


Diagnostic Trouble Code
(DTC) memory, checking and
erasing

Check DTC Memory (function 02)


- Connect VAS5051 tester Page 01-7 and
select vehicle system "01 - Engine electronics".
Engine should run at idle for this.

Note:
If engine doesn't start, crank engine using starter
for at least 5 seconds. Do not switch ignition off
afterward under any circumstance.

Display on VAS5051:
- In selection -1-, click on the diagnostic function "02 - Check DTC
memory".
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01-17
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
-120
.
Malfunctions that worsen emissions are indicated by an exhaust warning lamp (MIL) in the instrument cluster. Notes for
Malfunction Indicator Lamp (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 sporadically (temporarily occurring malfunctions) are identified with "sporadic" on display. The
word sporadic means "appearing or occurring at irregular intervals, occasional".
Do not immediately replace components that the 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 "sporadic".
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.
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gnostic Trouble Code
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11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU07.01.2

01-18
DTC codes 16395 - 17624

DTC
DTC text
Corrective action
SAE
VAG


P0011 16395 Bank 1 camshaft advance
adjustment
Specified value not
obtained Repair Manual, 1.8 Liter 4
-Cyl. 5V Turbo Engine Mechanical, Engine Code
(s): AWM, Repair Group 15; Checking camshaft adjustment

P0012 16396 Bank 1 camshaft
adjustment
Specified value not
obtained
P0101 16485 Mass Air Flow (MAF)
sensor -G70-
Implausible signal - Check Mass Air Flow (MAF) sensor Page 24
-59
P0102 16486 Mass Air Flow (MAF)
sensor -G70-
Signal too small
P0103 16487 Mass Air Flow (MAF)
sensor -G70-
Signal too large
Pa
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11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU07.01.2

01-19

DTC
DTC text
Corrective action
SAE
VAG


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): AWM, 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
P0116 16500 Engine Coolant Temperature
(ECT) sensor -G62-
Implausible signal - Engine Coolant Temperature (ECT) sensor, checking Page 28
-31
P0117 16501 Engine Coolant Temperature
(ECT) sensor -G62-
Signal too small
P0118 16502 Engine Coolant Temperature
(ECT) sensor -G62-
Signal too large
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11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU07.01.2

01-21

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
-94

P0137 16521 Bank 2, sensor 1
Voltage too low
P0138 16522 Bank 2, sensor 1
Voltage too high
P0139 16523 Bank1, sensor 2
Signal too slow
P0140 16524 Bank 2, sensor 1
No activity
P0236 16620 Charge air pressure
sensor -G31-
Implausible signal Repair Manual, 1.8 Liter 4
-Cyl. 5V Turbo Engine Mechanical, Engine Code(s):
AWM, Repair Group 21, Charge air system with turbocharger, checking

P0237 16621 Charge air pressure
sensor -G31-
Signal too small
P0238 16622 Charge air pressure
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gnostic Trouble Code
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11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU07.01.2

01-22

DTC
DTC text
Corrective action
SAE
VAG


P0300 16684 Combustion misfire detected
- Check fuel pressure Page 24
-32
- Check fuel injectors Page 24
-37
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
-55
P0304 16688 Cyl. 4 combustion misfire detected
- Fill fuel tank with fuel
P0321 16705 Engine Speed (RPM) sensor -G28-
Implausible signal - Check engine speed (RPM) sensor Page 28
-27
P0322 16706 Engine Speed (RPM) sensor -G28-
No signal
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11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
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pair&id=AUDI.B5.FU07.01.2

01-24

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):
AWM, Repair Group 26; Checking Secondary Air Injection (AIR) system

- Check hose setup (Secondary Air Injection -AIR- solenoid valve); check intake
system for leaks (false air) Page 24
-68

P0420 16804 Bank 1, catalytic
converter system
Not effective enough
Repair Manual, 1.8 Liter 4
-Cyl. 5V Turbo Engine Mechanical, Engine Code(s):
AWM, Repair Group 26
- Generate readiness code Page 01
-84
. If the same malfunction is indicated
again, replace catalytic converter.
P0422 16806 Bank 1, main catalytic
converter
Not effective enough
P0441 16825 Tank ventilation
system
Throughput faulty - Check Evaporative Emission (EVAP) canister purge regulator valve Page 24
-
114

Pa
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gnostic Trouble Code
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11/22/2002 htt
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play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU07.01.2

01-27

DTC
DTC text
Corrective action
SAE
VAG


P0601 16985 Control module faulty
- Replacing Engine Control Module (ECM) Page 24
-22
P0604 16988 Control module faulty
P0605 16989 Control module faulty
P0606 16990 Control module faulty
P0685 17069 Main relay -J271-
Open circuit - Check motronic Engine Control Module (ECM) voltage supply relay -J271-
Page 28
-13

P0686 17070 Main relay -J271-
Short circuit to Ground
(GND)
P0687 17071 Main relay -J271-
Short circuit to B+
P0688 17072 Main relay, load circuit -
J271-
Open circuit
Pa
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gnostic Trouble Code
(DTC
) memor
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g and erasin
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11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU07.01.2