2015 AUDI RS5 COUPE check engine light

Driving and th e environment
(D Tips
-Check the depth of the water before driving
through it.
- Do not stop the veh icle, drive in reverse or
switch the engine
off when driving through
water.
- Keep in mind that oncoming vehicles may
create waves that raise the water level and
make it too deep for your vehicle to dr ive
through safely.
- Avoid driving through sa lt water because it
can cause corrosion.
Warming up and cooling down
By carefully warming up and cooling down your
veh icle, you can help ensure that it is not over­
stressed unnecessar ily du ring sporty dr iv ing.
When warming up, the vehicle is driven at a max­ imum engine speed of 6000 RPM in order to ra ise
the engine oil temperature to a m inimum of
140 °F (60 °C). T he tires also only reach their full
road holding capab ility once they have wa rmed
up.
The cooling fan can continue to run in your vehi­
cle after the eng ine is switched
off. However,
d riving the vehicle to cool it dow n is part icu larly
important. During sporty d riving, the engine and
brakes , the exhaust system, and the transmission
all become extremely hot. Before you park the
vehicle, you should drive it for a few mi les/kilo ­
meters at light load in the low rpm range to al­
low it to cool down.
Catalytic converter
It is very important that your emission control
system (catalytic converter) is functioning prop­ erly to ensure that your vehicle is running in on
environmentally sound manner .
.. Always use lead -free gasoline c::> page 183,
Fuel supply.
.. Never ru n the tank down a ll the way to empty.
.. Neve r pu t too m uch motor oil in your engine
c::> page 191, 't:::?: Adding engine oil .
178
.. Never try to push -or tow-start your vehicle .
The catalytic converte r is an effi cient "clean-up"
device b uilt into the exha ust system of the veh i­
cle. The cata lytic conve rter burns many o f the
po llutants in the exhaust gas before they are re­
l eased into the atmosphere.
The exclusive use of unleaded fue l is c ritically im ­
po rtant for the life of the catalytic conver ter 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. Th is could resu lt in burns.
- Do not park or operate the vehicle in areas
where the hot exha ust system may come in
contact with dry grass, brush, fuel spill or
other material which can cause a fire.
- Do not apply additional undercoating or rustproof ing on or near the exhaust mani­
fold, exhaust pipes, catalytic converter or
heat shields. During dr iving, the substance
used for unde rcoat ing could overheat and
cau se a fire.
@ Note
- Be aware that just one tank fill ing with lead­
ed
fuel w ill al ready ser iously degrade the
performance of the catalytic converter.
- Do not exceed the correct engine oil level
c::>poge 191.
-Do not drive until the fue l tank becomes
completely empty . T he engine cou ld m isfire .
Unburned fu el could also get into the ex­
haus t sys tem a nd this could cause the cata­
lyt ic converte r to overheat.
- Do not turn
off the ignition while the vehicle
is
moving.
- Do not continue to operate your veh icle un­
der these condi tions, as otherwise f uel can
re ach the cat aly tic converter. This could re ­
s u lt in ove rheat ing of the c onve rter, requ ir­
ing its replacement .
- T o assure efficient oper ation of the Emission
~
Cont ro l System: ..,_

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Checking and Filling Hood
Releasing and opening the engine hood
The engine hood is released from inside the vehi­
cle.
Fig. 159 Driver's side footwell: e ng in e hood release lever
Fig. 160 Releas e lev er un der t he e ngin e hood
Before opening the engine hood, make sure that
the windshield wipers are flat against the wind­
shield . Otherwise, they could damage the paint
on the hood.
.. With the driver's door open, pu ll the lever un­
der the instrument panel in the direction of the
arrow
c::> fig . 159.
.. Ra ise the hood slightly c::> &.
.. Press the rocker switch under the hood upward
c::> fig . 160. This releases the catch .
.. Open the hood.
A WARNING
Hot engine coolant can burn you.
- To reduce the r isk of being burned, never
open the hood if you see or hear steam or
coolant escaping from the engine compa rt­
ment. Wait until no steam or coolant can be
Checking and Filling
seen or heard before carefully opening the
hood .
Closing the engine hood
.. Pull the hood down until the pressure from the
struts is reduced.
"' Let the hood
drop down and latch in place. Do
not try to push it shut;
it may fa il to engage
c::> &. -
A WARNING
A hood that is not comp letely latched could
fly up and block your view while driving.
- When you close the engine hood, check it to
make sure the safety catch has properly en­
gaged . The hood should be flush with the
surrounding vehicle body parts.
- If you notice while driv ing that the hood is
not secured properly, stop at once and close
it.
Working in the engine compartment
Be especially careful whenever you work in the
engine compartment.
-
Whenever you must perform any work in the
engine compartment, for example checking and
filling different fluids , there i s a risk of injury ,
burns and accidents. To prevent personal injury
always observe the following WARNINGS . The
engine compartment of any vehicle is a hazard­
ous area
c:> .&. .
A WARNING
-
To help avoid injury, before you check any-
thing under the hood:
- Turn off the engine.
- Remove the ignition key .
- Apply the parking brake.
- Move selector lever of automatic transmis-
sion to "P" (Park) .
-Always let the engine cool down. Hot com ­
ponents wi ll burn skin on contact .
- To reduce the risk of being burned, never
open the hood if you see or hear steam o r
coo lant escaping from the engine
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Check in g and Fillin g
Engine compartment
Engine compartment
These are the most important items that you can check.
Fig. 161 Typical layout for containers and eng ine oil filler cap
(D Coolant expansion tank (.J-) .. .. .
@ Jump start point(+) under a cover
@ Engine oil filler cap(~) .... .. .
@ Jump start point(-) with hex head
screw . ............... ...... .
® Brake fluid reservoir ((0) .. .. .. .
@ Windshield/headlight* washer con-
tainer
(Q) .................. .
&, WARNING
193
198,229
191
198,229 195
200
Before you check anything in the engine com­
pa rtment, always read and heed all WARN­
INGS
~ .&. in Working in the engine compart­
ment on page 187 .
Engine oil
Engine oil specifications
The engine oil used must conform to exact speci­
fications.
T he service interval disp lay in the instr ument
cluster of your vehicle will inform you when it is
time for an oi l change. We recommend that you
have your oil changed by an authorized A udi Serv ­
ice Advisor .
If you have to top off the o il between o il changes,
use the Audi oil qua lity standard specified in the
table .
Audi oil quality standard
G as oline
VW S02 00 or
eng ine vw 504 00
1 8 9

Checking and F ill in g
Using the proper engine o il is important for the
functionality and service life of the engine. Your
engine was factory-fi lled w ith a high-quality o il
which can usually be used throughout the ent ire
year.
@) Note
Your L imited New Vehicle Warranty does not
cover damage or malfunctions due to failure
to follow recommended ma intenance and use
requ irements as set forth in the Audi Ow ne r's
Manual and Wa rranty
& Ma intenance booklet .
- Use only a high quality eng ine oil t hat ex-
pressly comp lies w ith the Audi o il quality
standard specified for your vehicle's e ngine .
Using a ny other oil can cause se rious engine
damage.
- Do not mix any lubricants o r othe r addit ives
i nto the engine oil. Doing so can cause en ­
g ine damage.
(D Tips
If you need to add oil and there is none availa­
ble that meets the Audi o il quality standard
y o ur eng ine requires, you m ay add a total of
no more than 0.5 quart/li ter o f a h igh-quali ty
"synthet ic"oil that meets the fo llowing speci ­
fications .
- V ehicles wi th gasoline engine: AC EA A3 o r
API SM with a viscosity grade of SAE 0W- 30,
SAE SW -30 or SAE SW-40 .
- Fo r more informa tion abo ut engine oi l that
has been approved for your vehicle, please
contact either you r a uthorized Aud i dea ler
or Audi Customer Relations at
1 (800) 822-2834 or visit o ur web site at
www .aud iusa.com or www .aud icanada .ca .
Engine oil consumption
The engine in your vehicle depends on an ade­
quate amount of oil to lubricate and cool all of
its moving parts .
In order to provide effective lubrication and cool­
i n g of in ternal engine components, all interna l
combustion engines consume a certai n amount
of oil. O il consumption var ies from engine to en­
g ine and may change significant ly ove r the life of
190
the engine. Typically, eng ines with a specif ied
break-in period (see
¢ page 177) consume mo re
o il dur ing the b reak -in per iod than they consume
after oil consumption has stabili zed.
U nder normal cond itions , the rate of oi l con ­
s u mption depends on t he qu ality and viscosity of
the oil, the RPM (revolutions per minute) at
which the engine is operated, the ambient tem ­
perature and road condit ions. Further factors are
the amount of o il di lution from water condensa ­
tion or fuel residue and the ox idat ion level of the
o il. As any engine is s ubject to wear as mileage
builds up, t he oil consump tion may inc rease ove r
t ime unt il rep lacement of wo rn component s may
become necessary.
With a ll these va riab les coming into p lay, no
sta ndard ra te of oil consumpt ion can be estab­
li shed or spe cified . There i s no altern ative to reg­
u la r and freq uent checking o f the oil leve l, see
Note .
If the yellow e ngine oi l leve l wa rning symbo l El
in the instr ument cluster lights up, yo u should
chec k the o il level as soon as possible
¢ page 191 . Top off the oil at your ear liest con ­
venience ¢page 191.
A WARNING
Before you chec k anything in the eng ine com­
partment, always read and heed a ll WARN­
INGS¢ .&. in Working in the engine compart­
ment on page 187 .
@ Note
Driving with an insufficient oi l level is likely to
cause severe damage to the engine.
(D Tips
- The oil pressu re warning display. is not
an indicator of the oil level. Do not rely on
it . Instead, check the oil level in your en­
gine at regular intervals, preferably each
time you refuel, and always before going on a long trip.
- If you have the impression yo ur engine con­
sumes excessive amounts of oil, we r ecom-
mend that yo u consult an au tho rized Audi .,.

Checking and Filling
"' Place a thick rag over th e coolant expansion
tank and
carefully turn the cap counter-clock­
wise
¢ ,& .
"'Read the engine coolant level inside the coolan t
expansion tank
¢ fig . 164, ¢page 189,
fig. 16 1.
With a cold engine , the coolant level
should be between the ' 'MIN" and "MAX " mark­
ings
¢ fig . 165 -arrows- . When the engine is
warm, the level may be slightly above the
"MAX" marking.
"'Add coolant mixed in the correct ratio, if neces­
sary ¢
page 192 . Coolant may be a maximum
of 1 mm above the MAX marking.
"' Twist the cap on again
tightly .
The location of the coolant expansion tank can be
seen in the engine compartment illustration
¢ page 189.
To obtain an accurate reading , the engine must
be switched off.
The expansion tank in your vehicle is equipped
with an electric coolant level sensor.
When the coolant level is too low, the warning
light in the Auto-Check System¢
page 17 will
blink until you add coolant and the level has been
restored to normal. Even though there is an elec­
tric coolant level sensor, we still recommend you
check the coolant level from time to time.
Coolant loss
Coolant loss may indicate a leak in the cooling
system. In the event of coolant loss, the cooling
system should be inspected immediately by your
authorized Audi dealer. It is not enough merely
to add coolant.
In a
sealed system, losses can occur only if the
boiling point of the coolant is exceeded as a re­
sult of overheating.
Adding coolant
Replacement engine coolant must conform to ex­
act specifications ¢
page 192, Coolant.
We recommend using only coolant additive Gl2+
+ , G l3
or in an emergency Gl2+ . Do not use a
different additive . In an emergency use plain wa­
ter until you can get the correct additive and can
194
restore the correct ratio. This should be done as
soon as possible.
If you have lost a considerable amount of cool­
ant, then you should add cold antifreeze and cold
water only when the engine is cold.
Always use
new engine coolant when refilling.
Do not fill coolant above the "MAX" mark. Excess
coolant will be forced out through the pressure
relief valve in the cap when the engine becomes
hot.
,&_ WARNING
- The cooling system is under pressure and
can get very hot. Reduce the risk of scalding
from hot coolant by following these steps.
- Turn off the engine and allow it to cool
down .
- Protect your face, hands and arms from
escaping fluid and steam by covering the
cap with a large, thick rag .
- Turn the cap slowly and very carefully in a
counter-clockwise direction while applying
light, downward pressure on the top of
the cap .
- To avoid being burned, do not spill anti ­
freeze or coolant on the exhaust system or
hot engine parts. Under certain condi­
tions, the ethylene glycol in engine cool­
ant can catch fire.
- Antifreeze is poisonous. Always store anti­
freeze in its original container and well out
of the reach of children.
- If you drain the coolant, it must be caught
and safely stored in a proper container
clearly marked "poison".
(D Note
- Do not add any type of radiator leak sealant
to your vehicle's engine coolant. Adding ra­
diator repair fluid may adversely affect the
function and performance of your cooling
system and could result in damage not cov­
ered by your New Vehicle Limited Warranty.
- Coolant pollutes the environment and could
-
cause an engine fire. Excess coolant will be .,.

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forced out through the pressure relief valve
in the cap when the engine becomes hot.
- If, in an emergency, only water can be add­
ed, the correct ratio between water and an­
tifreeze
q page 192 must be restored as
soon as possib le.
@ For the sake of the environment
Drained coolant should not be reused . Always
dispose of used coolant while observ ing a ll
environmental regulations.
Radiator fan
The radiator fan switches on automatically by it­
self.
The radiator fan is driven by the engine via the V­
be lt. The viscous clutch regulates the speed of
the fan according to the temperature of the cool­
ant.
An auxiliary e lectr ic radiator fan * switches on and
off depending on coo lant temperature and other
veh icle operating conditions.
Afte r you switch the engine off, the a uxiliary fan
can cont inue running for up to 10 minutes -even
with the ignition off. It can even switch on again
l ater by itself
Q .&. , if
- the temperature of the engine coolant rises due
to the heat bui ld-up from the eng ine in the en­
gine compartment, or
- the engine compartment heats up because the
vehicle is parked in intense sunlight.
_& WARNING
- To reduce the r isk of personal injury never
touch the radiator fan.
- The aux iliary e lectr ic fan is temperature con­
trolled and can switch on suddenly even
when the engine is not running.
- The auxiliary radiator fan switches on auto­
matically when the engine coo lant reaches a
certain temperature and will continue to run
until the coolant temperature drops.
Ch eck in g and Fillin g
Brake fluid
Checking brake fluid level
The broke fluid level con be checked with a quick
glance.
F ig . 1 66 Engine compartment: Cover on the brake fluid
r eservoir
Before you check anyth ing in the engine compart­
ment,
a lw ays r ead and h eed all WARNING S
q ,& in Working in the engine compartment on
page 187.
., Read the brake fluid level from the brake fluid
reservoir
q fig. 166, r:> page 189, fig. 161. The
brake fluid level must be between the "MIN"
and "MAX" markings.
The brake fluid reservo ir is located at the rear
part ition of the engine compartment on the left
s ide
q page 189.
The fluid level may drop slightly after some time
due to the automatic adjustment of the brake
pads. This is not cause for alarm.
If the brake fluid level falls
considerably below
the "MIN" mark, the brake warning/indicator
light (U.S. models:
1111 , Canad ian models: .
will come on
Q page 15 . Do not continue to oper­
ate the vehicl e. The complete brake system
shou ld be thoroughly chec ked by an autho rized
A udi dealer or qualified workshop and the cause
corrected. If the brake fluid level is too low, the
brake warning/indicator light will illuminate .
Contact an a uthorized Audi dea ler
immedi ately .
(0 Tips
The brake fl uid reservoir is located under­
neath the cover.
195

Checking and Filling
-Before work is done on the electrical sys­
tem, disconnect the negative ground cable .
- Before performing any work on the electri­
cal system, switch off the engine and igni­
tion as well as any electrical equipment. The
negative cable on the battery must be dis­
connected . If you are just going to replace a
light bulb, then it is enough to switch off
the lights.
- Before disconnecting the battery, switch off
the ant i-theft alarm system! Otherwise you
will set off the alarm.
- When disconnecting the battery, first dis­
connect the negative cable and then the
positive cable.
- Before reconnecting the battery, make sure
all electrical consumers are switched off. Re­
connect the positive cable first and then the
negative cable. Never interchange the ca­
bles -this could start a fire!
- Never charge a frozen or a thawed-out bat­
tery. It could explode! If a battery has fro­
zen, then it must be replaced. A discharged
battery can freeze over at 32°F (0°C) .
- Make sure the vent hose is always attached
to the opening on the side of the battery.
- Never use batteries which are damaged.
There is the danger of an explosion! Always
replace a damaged battery.
A WARNING
California Proposition 65 Warning:
- Battery posts, terminals and related acces­
sories contain lead and lead compounds,
chemicals known to the State of California
to cause cancer and reproductive problems.
Wash hands after handling.
(D Note
- Do not disconnect the vehicle battery when
the ignition is switched on or when tile en­
gine is running, otherwise, you will damage
electronic components in the electrical sys­
tem.
- If your vehicle is going to stand for a long
period of time without being driven, protect
the battery from "freezing", otherwise it
198
will be damaged and will then have to be re­
placed.
Battery charging
Starting the engine requires a well charged bat­
tery.
Fig. 167 Eng ine compartment: Connectors for charger and
jumper cables
Always read and heed all WARNINGS below
¢
A and ¢ A in Working on the battery on
page 197.
.,. Turn off the ignition and all electrical consum­
ers.
.,. Make sure the area is well ventilated when you
charge the battery.
.,. Open the engine hood
¢ page 187.
.,. Open the cover on the positive pole¢ fig. 167.
.,. Connect the charger connectors according to
the instruct ions to the
jump start bolts . (Bolts
under the cover= "positive", Bolts with hex
head = "negative").
.,. Only now plug the mains lead for the charging
equipment into the wall outlet and turn it on
¢ &, .
.,. Make sure the charging rate is not over
30 amps/14.8 Volt.
.,. When the battery is fully charged : T urn the
charging equipment off and remove the mains
lead from the wall outlet.
.,. Now remove the clamps for the charging equip -
ment .
.,. Close the cover on the positive pole.
.,. Close the hood¢
page 187.
A discharged battery can freeze at temperatures
of only 32 °F (0 °C). Allow a frozen battery to
thaw completely before attempting to charge it
Ill>

Checking and Fill in g
with all environmental reg ulations. D isposing
of vehicle batteries improperly is
very danger­
ous to the env ironment.
Windshield/headlight*
washer container
F ig . 168 Engin e com partm en t: Cover o n the win d shi eld
and head lig ht• was he r fl ui d co ntainer
The washer flu id container is marked with the
symbo l~ on its cap
~fig . 168 , ~ page 189,
fig . 161.
(") N
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"' co a,
• Before you check anyth ing in the eng ine com ­
partment,
alw ay s re ad and he ed all WARN­
IN GS ~ ,& in Working in the engine compart­
ment on page 187 .
• Lift the fi ller cap tong ue to add w asher fl uid .
You can fill the container to the top.
• Press the cap back onto the filler neck after f ill-
ing the container .
You ca n find the rese rvoir
c apa city in the tab le in
~ page 234.
Clean water sho uld be used when fill ing up . If
possible, use soft water to prevent sca ling on the
washer jets. Always add a glass cleane r solu tion
(with frost protection in the winter) .
@) Note
Do not mix engine coo lant antifree ze or any
other add itives to fi ll up the windshie ld wash­
er reservoir .
200