AUDI A6 1999 C5 / 2.G AHA Engine On Board Diagnostic Owner's Manual

01-15

Code number structure (example)





USA vehicle with Leak Detection Pump (LDP): 0 6
Front-wheel-drive without traction control (ASR): 0
Automatic transmission 01V: 5
Audi A4: 1
Code number: 0 6 0 5 1 Note:
Vehicles with traction control (ASR) can be recognized by the ASR control light in the instrument cluster or by ABS/ASR On
Board Diagnostic (OBD).
Repair Manual, Brake System, Repair Group 01
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01-16

Check DTC Memory (scan tool function
02)


Required special tools and test equipment
VAG1551 Scan Tool (ST) with VAG1551/3
adapter cable

Checking

- Connect VAG1551/VAG1552 Scan Tool (ST)
and press buttons -0- and -1- to insert "Engine
Electronics" address word 01 (engine running at
idle) page 01
-8 .

Note:
If engine does not start:
- Operate starter to crank engine for approx. 6
seconds, then do not switch ignition off.

- Press PRINT button to switch scan tool printer
on (indicator light in button lights up). Rapid data transfer
HELP
Select function XX

Indicated on display
- Press buttons -0- and -2- to select "Check DTC Memory" function 02,
and press -Q- button to confirm input.
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01-17

X DTC reco
gnized

Indicated on display (number of stored malfunctions, or "No DTC
recognized")
Note:
If scan tool displays do not appear as indicated:
Scan tool operating instructions
If one or more malfunctions are stored:
Stored malfunctions are displayed one after another, and are printed out
along with applicable DTCs.
Rapid data transfer
HELP
Select function XX

Indicated on display (after all stored malfunctions)
If no DTCs are recognized:
-
Press button to advance through program sequence.- Press buttons -0- and -6- to select "End Output" function 06, and press
-Q- button to confirm input.
- Repair malfunctions according to Diagnostic Trouble Code (DTC) table
page 01
-18
.
- Erase DTC memory page 01
-49
.
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01-18
Diagnostic Trouble Code (DTC) table

Notes:

The DTC table is organized according to SAE and VAG diagnostic trouble codes.
The column labeled "MIL" specifies the MIL switching condition associated with that DTC.
DTCs that do not switch on the MIL after the malfunction is recognized by the ECM are identified by the MIL switching
condition "Off."
DTCs that do switch on the MIL immediately after the malfunction is recognized by the ECM are identified by the MIL
switching condition "Immed."
DTCs that are recognized by the ECM and switch on the MIL after two consecutive driving cycles (Dcy) are identified by
the MIL switching condition "2 Dcy."
Always correct malfunctions that are designated "immediately" as soon as possible, followed by those malfunctions that
are designated "2 Dcy."
When all repairs have been completed, erase DTC memory ( page 01
-49
) and then generate new readiness code
page 01
-73
.
DTCs that are recognized as a result of intermittent malfunctions, or DTCs that are not erased after repairs, are classified
as sporadic malfunctions. These are identified by the designation "SP" appearing in the display.
A sporadic malfunction will be erased if it no longer occurs after 50 driving cycles during which the engine reaching
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operating temperature.
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01-19

Diagnostic Trouble Code
(DTC)
Malfunction text
MIL
Corrective action
SAE
VAG



P0102 16486 Mass or Volume Air Flow
Circ.
Low Input 2
Dcy - Check Mass Air Flow (MAF) sensor -G70- page 24
-68

P0103 16487 Mass or Volume Air Flow
Circ.
High Input
P0112 16496 Intake Air Temp. Circ.
Low Input 2
Dcy - Check Intake Air Temperature (IAT) sensor -G42-
page 24
-82

P0113 16497 Intake Air Temp. Circ.
High Input
P0116 16500 Engine Coolant Temp. Circ.
Range/Performance 2
Dcy - Check Engine Coolant Temperature (ECT) sensor -
G62- page 24
-75

P0117 16501 Engine Coolant Temp. Circ.
Low Input
P0118 16502 Engine Coolant Temp. Circ.
High Input
P0121 16505 Throttle/Pedal Pos. Sensor A 2
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Circ.
Range/Performance Dcy
- Check Throttle Position (TP) sensor -G69- page
24
-128

P0122 16506 Throttle/Pedal Pos. Sensor A
Circ.
Low Input
P0123 16507 Throttle/Pedal Pos. Sensor A
Circ.
High Input
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01-20

Diagnostic Trouble
Code (DTC)
Malfunction text
MIL
Corrective action
SAE
VAG



P0130 16514 O2 Sensor Circ.,
Bank1-Sensor1
Malfunction 2
Dcy - Check Heated Oxygen Sensor (HO2S) -G39- and O2S control
(bank 1, sensor1) page 24
-22

P0131 16515 O2 Sensor Circ.,
Bank1-Sensor1
Low Voltage
P0132 16516 O2 Sensor Circ.,
Bank1-Sensor1
High Voltage
P0133 16517 O2 Sensor Circ.,
Bank1-Sensor1
Slow Response 2
Dcy - Check HO2S -G39- aging (bank 1, sensor1) page 24
-60
P0134 16518 O2 Sensor Circ.,
Bank1-Sensor1
No Activity Detected 2
Dcy - Check HO2S -G39- and O2S control (bank 1, sensor1) page
24
-22

P0136 16520 O2 Sensor Circ.,
Bank1-Sensor2
Malfunction 2
Dcy - Check Oxygen Sensor (O2S) behind Three Way Catalytic
Converter (TWC) -G130- (bank 1, sensor 2) page 24
-42

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P0137 16521 O2 Sensor Circ.,
Bank1-Sensor2
Low Voltage
P0138 16522 O2 Sensor Circ.,
Bank1-Sensor2
High Voltage
P0140 16524 O2 Sensor Circ.,
Bank1-Sensor2
No Activity Detected
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01-21

Diagnostic Trouble
Code (DTC)
Malfunction text
MIL
Corrective action
SAE
VAG



P0150 16534 O2 Sensor Circ.,
Bank2-Sensor1
Malfunction 2
Dcy - Check Heated Oxygen Sensor (HO2S) -G108- and Oxygen
Sensor (O2S) control (bank 2, sensor 1) page 24
-22

P0151 16535 O2 Sensor Circ.,
Bank2-Sensor1
Low Voltage
P0152 16536 O2 Sensor Circ.,
Bank2-Sensor1
High Voltage
P0153 16537 O2 Sensor Circ.,
Bank2-Sensor1
Slow Response 2
Dcy - Check HO2S -G108- aging (bank 2, sensor 1) page 24
-63
P0154 16538 O2 Sensor Circ.,
Bank2-Sensor1
No Activity Detected 2
Dcy - Check HO2S -G108- and O2S control (bank 2, sensor 1)
page 24
-22

P0156 16540 O2 Sensor Circ.,
Bank2-Sensor2
Malfunction 2
Dcy - Check O2S 2 behind Three Way Catalytic Converter (TWC) -
G131- (bank 2, sensor 2) page 24
-52

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