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On Board Diagnostic
System (OBD)
Malfunction Indicator lamp (MIL)
The Malfunction Indicator Lamp (MIL) ¢'4 in the
instrument cluster
¢ page 11, fig. 7 is part of the
On-Board Diagnostic (OBD II) system.
The warning/indicator light illuminates when the
ignition is switched on and goes out after the en-
gine starts and the idle has stabilized . This indi-
cates that the MIL is working properly .
If the light doe s not go out after the engine is
started, or illuminates while you are driving, a
malfunction may exist in the engine system .
If
the light illuminates, the catalytic converter
could be damaged.
Continue driving
with reduced power (avoiding
sustained high speeds and/or rapid accelera-
tions) and have the condition corrected. Contact
your authori zed Audi dealer.
If the light illuminates, the electronic speed lim-
iter may also be malfunctioning . For more infor-
mation ¢
page 23, Electronic speed limiter.
An improperly closed fuel filler cap may also
cause the MIL light to illuminate (only vehicles
with gasoline engine)
¢ page 212 .
On-Board Diagnostics
Fig. 20 Location of Data Link Connect or (DLC)
On-Board Diagnostics monitors the components
of your emission control system. Each monitored
component in your engine system has been as-
signed a code. In case of a malfunction, the com-
ponent will be identified and the fault stored as a
code in the control module memory.
Driver in fo rma t ion system
The MIL light may also illuminate if there is a
leak in the on-board fuel vapor recovery system.
If the light illuminates after a refueling, stop the
vehicle and make sure the fuel filler cap is prop-
erly closed (only vehicles with gasoline engine)
¢ page 212 .
In order to make an accurate diagnosis, the stor-
ed data can only be displayed using special diag-
nostic equipment (generic scan tool for OBD).
In order to connect the special diagnostic equip-
ment, push the plug into the Data Link Connector
(DLC). The DLC is located to the right of the hood
release ¢
fig. 20 .
Your authorized Audi dea ler or qualified work-
shop can interpret the code and perform the nec-
essary repair.
A WARNING
-
~
Do not use the diagnostic connector for per-
sonal use. Incorrect usage can cause malfunc-
tions, which can increase the risk of a colli-
sion!
Electronic speed limiter
Your vehicle may be factory equipped with tires
that are rated for a maximum speed of 130 mph
(210 km/h). This is less than the maximum speed
of your vehicle. To reduce the risk of sudden tire
failure and loss of control if the vehicle is operat-
ed at excessive speeds, your vehicle also has an
electronic speed limiter. The electronic speed
limiter prevents your vehicle from going faster
than the tire speed rating . For more information
¢ page 237.
If the engine control unit receives faulty vehicle
road speed signa ls, the Malfunction Indicator
Lamp (MIL)
¢4will illuminate. If this occurs,
contact the nearest authori zed Audi dealer for
assistance.
SQS
Your vehicle's top speed is electronically limited
to 155 mph (250 km/h).
If the engine control unit rece ives fa ulty vehicle
road speed signals, the Malfunction Indicator lllJ,,
23
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