engine overheat AUDI S3 SEDAN 2015 User Guide

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The catalytic conve rter is an efficient "clean -up"
device bui lt into the exhaust system of the vehi ­
cle. The catalytic converter burns many of the
pollutants in the exhaust gas before they are re­
leased into the atmosphere.
The exclusive use of unleaded fue l is critically im­
portant for the life of the catalytic converter and
proper functioning of the engine .
A WARNING
The temperature of the exhaust system is
high, both when driving and after stopping
the engine.
- Never touch the exhaust tail pipes once they
have become hot. This could result in burns.
- Do not park or operate the vehicle in areas
where the hot exhaust system may come in contact with dry grass, brush, fue l spill or
other material which can cause a fire .
- Do not apply additional undercoating or
rustproofing on o r near the exha ust man i­
fold, exhaust pipes, catalyt ic converte r or
heat s hields. Dur ing driv ing, the subs tance
u5ed for undercoating could overheat and
cause a fire .
(D Note
-Be awa re that just one tank f illing wit h lead­
ed
f uel will a lready se riously degrade the
performance of the c ata lytic conver ter.
- Do not exceed the co rrect engine oil leve l
9page203.
-Do not d rive until the fuel tank becomes
complete ly empty. The eng ine could misfi re.
U nburned f uel co uld also ge t in to the e x­
haust system and this could ca use the cata ­
l ytic converter to overheat.
- Do no t sw itch off the ignition wh ile the vehi­
cle is moving.
- Do not con tinue to oper ate yo ur vehicle un­
der these cond itions, as o therwise fue l can
r each the catalytic converte r. This cou ld re­
su lt in overheating of the converter, requir­
i ng its replacement.
- To assure efficient ope ration of the Emission
Control System:
Checking and Fillin g
- Have your vehicle maintained properly and
in accordance with the serv ice recommen­
dat ions in yo ur Warranty
& Maintenance
booklet.
- Lack of prope r maintenance as we ll as im­
p roper use of the vehicle will impair the
f u nction of the emission control system
and could lead to damage.
@ For the sake of the environment
Even when the Emission Control System is op­
erating properly, the exha ust gas can have a
su lfur-like exhaust gas sme ll under some op­
erating states. Th is depends on the s ulfur
content of the fuel b eing used. Us ing a diffe r­
ent bra nd of fue l may he lp, or fi lling the tank
wi th lead-free su per grade gaso line.
Diesel particulate filter
App lies to vehicles: wit h diese l eng ine
T he diese l part icu late filter filters nearly all of
the soot pa rticles ou t of the exha ust. The filter
cl ea ns itself a utoma tic all y unde r no rm al driving
con dit ions. If the filte r cannot clean itse lf (for ex­
amp le, because yo u are only driving sho rt distan ­
ces), th e fi lter becomes clogged with soot and
the
II symbol for the diese l partic ulate filter il­
l uminates
9page 22.
A WARNING
-Do not park your veh icle over flammable
materials such as grass or leaves because
the high temperature of the diesel part icu­
la te filte r could sta rt a fi re.
-
- Do not app ly an underbody protectant in the
exhaust system area or a fire cou ld start.
Selective catalytic
reduction
General information
App lies to vehicles: wit h diese l eng ine
In veh icles with selective catalytic reduction, a
u rea solution (AdBlue) is injected into the ex­
haust system before a nitrogen oxide cata lytic
conve rter to redu ce nitrogen emissions.
195

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-Drain th e oi l into a container desi gned for
this purpose, one large enough to ho ld at
least the total amount of oil in your engine .
- Engine oil is poisonous . Keep it well out of
the reach of children.
- Continuo us contact with used engine oil is
harmful to your sk in. A lways protect your
sk in by washing oil off thoroughly w ith soap
and water.
(D Note
Never mix oi l addit ives with your engine oi l.
These additives can damage your eng ine and
adversely affect your Audi Limited New Veh i­
cle Warranty .
@) For the sake of the environment
-Before changing your oi l, f irst make sure
you know where you can properly dispose of
the used oil.
- Always d ispose of used engine oil proper ly.
Do not dump it on garden soil, wooded
areas, into open streams or down sewage
d rains .
- Recycle used e ngine oi l by taking it to a used
engine oil collection facility in your area, or
contact a service station .
Cooling system
Coolant
The engine coolant performs two functions: it
keeps the engine from overheating and it pro ­
tects the engine from freezing in the winter.
The cooling system is sea led and generally re ­
q ui res lit tle atten tion.
The cooling system has been filled at the factory
w ith a pe rma nen t coolan t which does no t need to
be ch anged . T he coolant consists o f a mixture o f
specia lly condit ioned wa ter and the man ufactu r­
er's glycol -based coolant additive Gl3 antifreeze
with anticor rosion add itives (SO% for USA mod­
e ls · 60% for Canadian models) . Th is m ixture bot h
'
assures the nece ssary fros t protection and p ro-
tects meta l components in the engine 's cooling
Checking and Fillin g
system from corrosion and scaling . It also raises
t h e boiling point of the coo lant .
D o no t redu ce the con cen tra tion of the coolan t in
the summer by ad ding plain water.
The prop or­
tion of coolant additive mu st be at least 50%
but not more than 60%
to maintai n antifr eeze
protection and cooling efficiency . If the coo lant
frost pro tec tion is too low, the coo lant co uld
freeze and damage the vehicle heating and en­
gine cooling system .
For year- ro und driving, antifreeze is added at the
factory for temperatures down to :
-- 31°F(-3S° C)USA
- -40 °F ( - 40 ° C) C anada.
If you must add coolant, use a mixture of water
and coolant additiv e. Mix ing the coo lant add it ive
with dis tilled wa te r is recommended .
A WARNING
Befo re you c hec k anythi ng i n the engi ne com ­
partment, always re ad and heed a ll WA RN­
IN GS
~page 198.
(D Note
- Befor e wi nter sets in , have the coo la nt
c hecke d to see if the cool an t additive in you r
vehicle is sufficient to meet the climate con ­
ditions . This is espec ia lly impo rtant if you
live in a region where the winter is extreme ­
ly cold . If necessary, increase the proportion
of coolant additive to 60%.
- When adding coolant additive to yo ur cool ­
ing system, remember:
- We recommend us ing o nly coo la nt addi­
tive G12 ++ o r G13 ( che ck the label) fo r
your ve hicl e. This coolant addi tive is av ail­
a ble at autho rized Aud i dea le rs . Othe r
types of ant ifreeze can significant ly re­
d uce corrosion protection. The resulting
corrosion can ca use a loss o f coolant and
serious engine damage.
- Do not add any type of rad iator leak sealant
to y our vehicle's engine coolant. Adding ra­
diator repa ir fluid may adversely affect the
function and perfo rmance of your cooling .,,.
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