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On Board Diagnostic
System (OBD)
The On-Board Diagnostic System monitors the
engine and transmission components that influ-
ence emissions.
Fig. 176 Footwell on left side of th e vehicle: connectio n
port fo r the On-Board Diagnostic System (OBD)
On-Board Diagnostic System
Engine data can be read out at the On-Board Di-
agnostic System connection port using a special
testing device
r::;, fig . 176.
Ind icat or light
If thE' ¢..ift indicator light blinks or turns on, there
is a malfunction that is causing poor emissions
quality and that could damage the catalytic con-
verter .
Drive slowly to an authorized Audi dealer or au-
thor ized Audi Service Facility to have the mal-
function corrected .
The indicator light can also turn on if the fuel fill-
er cap is not closed correct ly c::;,page 186.
A WARNING
Incorrect use of the connection port for the
On-Board Diagnostic System can cause mal-
functions, which can then result in accidents
and ser ious injuries.
- Only allow an author ized Audi dealer or au-
thorized Audi Service Facility to read out the
engine data.
-
Chec k ing a nd Filling
Engine compartment
Working in the engine compartment
Special care is required if you are working in the
engine compartment
For wo rk in the engine compart ment , such as
checking and fi lling flu ids, t here is a risk of in-
jur y, scalding, accident s, and burns. For t his
reason, foll ow all the warnings and general
safety precaution s provided in the following
in-
formati on. The engine compartm ent is a dan-
gerous area in the vehicle.
r::;, &..
A WARNING
- Turn the engine off.
- Switch the ignition off.
- Set the parking brake.
- Select the "P" selector lever position .
- Let the eng ine cool down .
- Never open the hood when there is steam or
coolant escaping from the engine compart-
ment, because there is a risk that you could
be burned . Wait unt il no steam or coolant is
escaping.
- Keep children away from the eng ine com-
partment .
- Never sp ill fluids on a hot engine. These flu-
ids (such as the freeze protection contained
in the coolant) can catch fire.
- Avoid short circuits in the electrical system .
- When working in the engine compartment,
remember that the radiator fan can switch
on even if the ignition is switched off, which
increases the risk of personal injury.
- Never open the cap on the coolant expan-
sion tank when the engine is warm . The
cooling system is under pressure.
-To protect your face, hands, and arms from
hot steam or coolant, cover the cap with a
large cloth when opening .
- Do not remove the eng ine cover under any
circumstances . This increases the risk of
burns.
- If tests need to be performed with the en-
gine runn ing, there is add it iona l danger due
to moving components (such as the ribbed
~
1 8 9
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