2015 AUDI RS5 CABRIOLET check engine light

32 Opening and clo sing
keys. Unguarded access to the keys pro­
vides children the opportunity to start the engine and/or act ivate vehicle sys­
tems such as the power w indows etc . Un­
supervised operation of any veh icle sys­
tem by ch ildren can res ult in serious in­
Jury.
- Do not remove the key from the ignition
lock un til the vehicl e has come to a com­
plete stop. Otherwise the steering col­
um n lo ck could sud denly e ngage -caus ­
ing the risk of an accident.
@ Tips
- The operation of the remote cont ro l key
c a n be tempo rarily disru pted by in terfer­
ence from tran smi tters in t he v ici nity of
t h e veh icle work ing in the same frequen ­
cy ra nge (e.g . a ce ll phone, radio equip­
ment).
- Fo r security reasons, replacement keys
a re on ly availab le from author ized Audi
dealer.
- For Decla ration of Compliance to United
States FCC and Industry Canada regu la­
tions
c:> page 267.
Removing the mechanical k ey
F ig . 19 Remote ma ster key : remov ing the mec hanic al
key
" Press the release button ® c=>fig . 19.
"Pull the mecha nica l key @out of the maste r
key .
Using the mechan ica l key , you can :
- lock and unlock* the glove compartment on
the passenger's sid e ¢
page 66 . -
lock and unlock the vehicle manua lly
¢ page 35 if this should not be possible
w ith the master key.
- use the ignition key emergency release
¢ page 33.
Check light and battery in the master
key
•
Fig. 20 Remote mas ter key: r em ovin g th e bat te ry h old ­
er
Check light in the master key
The check light@¢ fig. 20 in the mas ter key
provides information abo ut different condi ­
t ions .
" The check light turns on b riefly once when a
bu tton is pressed , and during an " inquiry "
by the convenience key system .
" If the check light does not come on, the bat­
t ery is dead a nd has to be replaced. In addi­
t ion, when the batte ry is dead the
!I indi ­
ca tor ligh t a ppears in the instr ume nt clu ster
disp lay as well as the message
Plea se
change key battery .
Master key battery replacement
" Remove th e mechan ica l key r=o page 32.
" Press the re lease b utton @ r=o fig. 20on the
bat tery ho lder and at the same time pu ll the
battery ho lder o ut of the maste r key in the
d irection of the ar row.
" Insta ll the new battery CR 2032 with the
"+ " sign facing down.
" Push the battery holder carefully into the
master key.
" Insta ll the mechanical key .

174 Intelligent technology
Braking
What affects braking efficiency?
New brake pad s
Du ring the first 2 50 miles (400 k m), new
b ra ke pads do not possess their fu ll braking
effect , they have to be "broken in" first¢.&. .
The break-in period can be considerably lon­
ger for vehicles with ceramic brake rotors*.
You can compensate for this slightly reduced br aking power by push ing harder on the brake
pedal. Avoid heavy braking loads during the
b reak-in per iod.
Operating conditions and d riving h abits
The brakes on today's automobi les are st ill
subject to wear, depend ing largely on operat­
ing conditions and dr iv ing habits ¢.&. . On
vehicles that are e ithe r dr iven mostly in stop­
and-go city traffic o r are driven ha rd, the
b rake pads should be checked by you r aut hor­
iz ed A udi de aler more often than specified in
the
Warrant y & Maintenan ce booklet . Fail ure
to have your b ra ke pads inspected can resu lt
in red uced brake performance.
On steep slopes, yo u sh ou ld use t he b ra ki ng
effect of the eng ine. Th is w ay, you preven t un­
necessa ry wear on the brake system . If you
must use yo ur brakes, do not ho ld the brakes
down continuously. P ump the brakes at inter ­
va ls.
Operating noise
N oises may occur when braking depending on
the speed, braking fo rce and outside condi­
tions s uch as temperature a nd h umidity.
Due to the na ture of the mate rials used i n ce­
ramic brake rotors*, noises may become more
apparent at low speeds.
Effect of water and road salt
I n ce rtain situat ions, for exampl e after d riving
throug h wate r, in heavy ra in, after overn igh t
conde nsation or afte r washi ng your c ar, the
b ra ki ng effect can be reduced by moisture or
ice on the bra ke rotors and b rake pads. The brakes must be dr
ied first with a few careful
brake applications .
At highe r speeds and with the winds hield wip­
ers t urned on, the b ra ke pads press against
the b rake roto rs fo r a short amount o f time .
This occurs at regular intervals without the drive r not icing and p rov ides for better brake
response time under wet conditions.
The effectiveness of the brakes can be red uced
whe n the vehicle is driven on a sa lt -covered
road and the brakes are not used . Likewise,
you clean off accumulated salt coating from brake d iscs and pads with a few cautious ap­
plicat ions of the bra ke
¢ .&. .
D ue to the ir s urface characteristics, ceramic
brake rotors* absorb moisture in such condi­
tions . T his can cause a temporary reduction in
braking force compared to dry brakes . You can
compensate for th is by pressi ng the brake
p eda l harde r.
Corrosion
There may be a tende ncy for dirt to build up
on the brake pads and corros ion to form on
the d iscs if the car is not driven regu larly or
only for short trips w it h litt le use of the
brakes .
If the brakes are not used frequently, or if cor­
ros io n has formed on the discs, it is adv isable
to clean off the pads and discs by braking
firmly a few times from a moderately h igh
speed ¢.&. .
Faults in the brake system
If you shou ld notice a sudden increase in
brake pedal trave l, then one of the two brake
c ir cuits may have fa iled
c::> .&. .
Low brake fluid level
Malfunctions can occur in the brake system if
t h e brake fluid level is too low. The brake flu id
level is monitored electro nically .
Brake boo ster
The brake booster increases the pressure that
yo u generate with the brake peda l. It works
on ly when the engine is running
. ¢ .&. .,.

180 Driving and en vironm ent
8_ WARNING
After driving through water, mud, slush,
etc ., the brakes may be slow to take effect
because of wet brake rotors and pads. Dry
the brakes first by braking carefully to re­
store the full braking effect.
(D Note
Vehicle components such as the engine,
transmiss ion, suspension or electrical sys­
tem can be severely damaged by driving
through wate r.
@ Tips
- Check the depth of the water before dr iv­
i ng through it.
- Do not stop the veh icle, dr ive in reverse
or switc h the engine off when driving
t hr ough water.
- Keep in mind that oncoming vehicles
may c reate waves that raise the water
l evel and make it too deep fo r you r vehi­
cle to dr ive through safely.
- Avoid dr iving thro ugh salt water because
i t can ca use corrosion.
Warming up and
cooling down
-
By carefully warming up and cooling down
your ve hicle, you can he lp ensure that it is not
overstressed unnecessarily dur ing sporty driv ­
ing.
When warming up, the vehicle is d riven at a
maximum engine speed of 6000 RPM in order
to raise the engine oi l temperature to a mini ­
mum of 140
°F (60 °(). The tires also only
reach their full road holding capability once
they have warmed up .
The cooling fan can contin ue to run in your ve­
h icle after the engine is switched off. Howev­
er, driving the vehicle to cool it down is part ic­
ularly important. During sporty driving, the
engine and brakes, the ex ha ust system, and
the transm ission all become extremely hot.
B efore you park the vehicle, you shou ld drive it for a few miles/kilometers at
light load in
the low rpm range to allow it to cool down.
Catalytic converter
It is very important that your emission con­
trol system (catalytic converter) is function­
ing properly to ensure that your vehicle is run­
ning in an environmentally sound manner.
.. Always use lead-free gasoline c:> page 190,
Fuel supply.
.. Never run the tank down all the way to emp­
ty .
.. Never put too much moto r oil in your engine
c:> page 199, 't::71 Adding engine oil .
.. Never try to p ush- or tow -sta rt yo ur vehicle.
The catalytic converter is an efficient "clean­
up" device bu ilt into the exhaust system of
t h e vehi cle. The cata lytic conve rter bu rns
many of the pollu tan ts i n t he exh aust gas be­
f ore they are re lease d into the atmosphere.
T he exclusive use of unleaded fue l is critica lly
impor tant for the life of the catalyt ic convert­
er and prope r fu nct ion ing of the engi ne.
8_ WARNING
- T he temperature of the exhaus t system
is high, both when driving and after stop ­
p ing the engine.
- Never touch the exhaus t tail pipes once
they have become hot . This cou ld result
in burns .
- Do not park or operate the vehicle i n
areas where the hot exha ust system may
come in contact with dry grass, brush,
fue l spill or other material wh ich can
cause a fire.
- Do not app ly additional undercoating or
rustproofing on or near the exhaust
manifold, exhaust pipes, catalytic con­
ver ter or heat shields . Dur ing driv ing, the
substance used for undercoating could
overheat and cause a fire.

182 Driving and en vironm ent
Avoid full throttle
Driving at moderate speeds saves fuel and
improves your mileage .
"'Try and keep well below your car 's max imum
speed.
Accelerating gently reduces fuel consump­
tion, engine wear, and does not disturb the
environment. F ue l consumption, exhaust emissions and en ­
g ine no ise increase d isproportionately at high
speeds. If you dr ive at approximately three
quarters of top speed, fuel consumption will be reduced by one half. Never dr ive faster
than the posted speed limit and weather con­
d itions permit .
Reducing unnecessary idling
Even when your car is just idling it burns up
fuel.
"'Shut the engine off when you are not dr iv ing
the vehicle .
"'Do not warm up the veh icle by letting the
engine run at idle .
It makes sense to shut
off the e ngine in traff ic
jams, when waiting for trains to pass at ra il­
road crossings , or at traff ic lights that have
l ong wa its on red. Turning the engine
off fo r
just
30-40 seconds saves more fue l than is
bu rned s tarting the eng ine again .
It takes a long time for the engine to warm up
fu lly when it is running at idle . Howeve r, wear
and nox ious em issions are especially high
when the engine is warming up. So you should
drive away as soon as you start the engine and
avoid running at high rpms while the engine is
still warming up .
([) Note
Do not leave engine idling unattended af ­
ter starti ng . If warning lights should come
on to indicate improper operation, they
wou ld go unheeded. Extended idling also
produces heat, which cou ld result in over- heating o
r othe r damage to the ve hicle or
other property .
Regular maintenance
A badly tuned engine unnecessarily wastes a
lot of fuel.
"' Have your ve hicle serviced at reg ular in ter -
vals.
By having your veh icle regu la rly serviced by an
a utho rized Aud i dea le r helps to ensure that it
runs properly and econom ic all y. The cond it ion
of your veh icle not on ly affe cts its safety and
ability to ho ld its va lue, it a lso affects
fuel
con sumption .
Check your oil ea ch time you fill your tank.
The amount of o il used is re lated to engine
load and speed .
It is normal for the oil consumption of a new
engine to reach its lowest value after a certa in
mileage has bee n driven.
You must drive your veh icle about 3,000 m iles
(5,000 kilometers) before you can properly
assess oil consumpt ion.
This also app lies to fue l cons umption and en­
gine output.
(D Note
- Have your vehicle maintained proper ly
and in accordance with the service rec ­
ommendations in your Warranty
& Main­
tenance booklet. Lack of proper ma inte­
nance as well as improper use of the ve­
hicle will impair the function of the
em iss ion contro l system and cou ld lead
to damage.
- Do not alter or remove any component of
the Emission Control Sys tem unless ap­
proved by the manufacture r.
- Do not alte r or remove any device, such
a s hea t sh ie lds, swi tches, ig nitio n w ires,
valves, which are designe d to p rotec t
your vehicle's Emission Control System
and other impo rtant vehicle compo­
nents .

"' N
a: LL co
rl I.O
"' rl
"' rl
Checking and filling Engine hood
Releasing and opening the engine hood
The engine hood is released from inside the
vehicle .
Fig . 172 Dr iver's side footwell: eng ine hood release
lever
F ig . 173 Re lease lever un der the engine hood
Before opening the engine hood, make sure
that the windshield w ipers are flat against the
windshield. Otherwise, they could damage the
paint on the hood.
.. With the driver's door open, pu ll the lever
under the instrument panel in the direction
of the arrow
q fig. 172.
.. Raise the hood slightly q &.
.. Press the rocker switch under the hood up­
ward
c::> fig . 173 . This re leases the catch .
.,. Open the hood.
& WARNING
Hot engine coo lant can burn you.
- To redu ce the r isk of being burned, never
open the hood if yo u see or hear steam
or coolant escaping from the engine
compartment. Wait until no steam or
Checkin g and fillin g 195
coolant can be seen or heard before care­
fully 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 fail to en­
gage
q &, .
_&. WARNING
-
A hood that is not comple tely latched
could fly up and b lock your view while dr iv­
ing.
- When you close the engine hood, chec k it
to make sure the safety catch has p ro pe r­
ly engaged . The hood sho uld be flush
with the surrounding vehicle body parts .
-If you notice while driv ing that the hood
is not secured prope rly, stop at once and
close it.
Working in the engine compartment
Be especially careful whenever you work in the engine compartment .
Whenever yo u mu st p erform an y w or k in th e
eng in e compa rtment, for example checking
and filling differ ent fluid s, there i s a ri sk of
injury , burns and accidents. To prevent per­
sonal injury always obser ve the following
WARNINGS . The eng ine compa rtment of an y
v ehicle is a hazardous are a
q 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 trans -
mission to "P" (Park).
- Always le t the engine cool down . Hot
components wi ll bur n skin on contact .

"' N
a: LL co
rl I.O
"' rl
"' rl
Checking and fillin g 197
Engine compartment
Engine compartment
These are the most important items that you can check.
Fig. 174 Typical layout for containers and engine oil filler cap
(D Coolant expansion tank (- L) . . . 202
@ Jump start point(+) under a cov-
er .. .. ... ....... ........ ..
207, 256
@ Engine o il filler cap ( @ Jump start point(-) with hex
head screw ............ .... .
207, 256
© Brake flu id reservoi r((())) . . . . . 204
® W indshie ld/headlight* washer
container
(0) . . . . . . . . . . . . . . 208
A WARNING
Before yo u check anything in the engine
compartment, always read and heed all
WARNINGS
q .& in Working in the engine
compartment on page 195.
-
Engine oil
Engine oil specifications
The engine oil used must conform to exact
specifications .
The service interval disp lay in the instrument
cluster of your vehicle will inform y ou when it
is time for an oil change. We recommend that
you have your oil changed by an authorized
Audi Se rv ice Advisor .
If you have to top off the o il between o il
changes, use the Audi o il quality standard
specified in the tab le.
Audi oil quality standard
Gasoline
VW 502 00 or
eng ine vw 504 00 ...

198 Checking and filling
Using the proper engine oil is important for
the functionality and service life of the en­
gine. Your engine was factory-filled with a
high-quality oil which can usually be used
throughout the entire year.
0 Note
Your Limited New Vehicle Warranty does
not cover damage or malfunctions due to
failure to follow recommended mainte­
nance and use requirements as set forth in
the Audi Owner's Manual and Warranty
&
Maintenance booklet.
- Use only a high quality engine oil that ex­
pressly complies with the Audi oil quality
standard specified for your vehicle's en­
gine . Using any other oil can cause seri­
ous engine damage.
- Do not mix any lubricants or other addi­
tives into the engine oil. Doing so can
cause engine damage.
If you need to add oil and there is none
available that meets the Audi oil quality
standard your engine requires, you may
add a total of no more than 0.5 quart/liter
of a high-quality "synthetic"oil that meets
the following specifications.
- Vehicles with gasoline engine: ACEA A3
or API SM with a viscosity grade of
SAE 0W-30, SAE SW-30 or SAE SW-40.
- For more information about engine oil
that has been approved for your vehicle, please contact either your authorized
Audi dealer or Audi Customer Relations
at 1 (800) 822-2834 or visit our web site
at www.audiusa .com or
www .audicanada .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
cooling of internal engine components, all in­
ternal combustion engines consume a certain amount of oil. Oil consumption varies from
engine to engine and may change significantly
over the life of the engine. Typically, engines
with a specified break-in period (see
¢ page 179) consume more oil during the
break -in period than they consume after oil
consumption has stabilized.
Under normal conditions, the rate of oil con­
sumption depends on the quality and viscosity
of the oil, the RPM (revolutions per minute) at
which the engine is operated, the ambient
temperature and road conditions . Further fac­
tors are the amount of oil dilution from water
condensation or fuel residue and the oxida­
tion level of the oil. As any engine is subject to
wear as mileage builds up, the oil consump­
tion may increase over time until replacement of worn components may become necessary.
With all these variables coming into play, no
standard rate of oil consumption can be es­
tablished or specified. There is no alternative
to regular and frequent checking of the oil lev­ el, see
Note.
If
the yellow engine oil level warning symbol
El in the instrument cluster lights up, you
should check the oil level as soon as possible
¢ page 199. Top off the oil at your earliest
convenience
¢ page 199.
A WARNING
--
Before you check anything in the engine
compartment, always read and heed all
WARNINGS¢
& in Working in the engine
compartment on page 195.
{(D Note
Driving with an insufficient oil level is like­
ly to cause severe damage to the engine .
(D Tips
- The oil pressure warning display. is
not an indicator of the oil level. Do not
rely on it. Instead, check the oil level in
your engine at regular intervals, pref­ erably each time you refuel, and always
before going on a long trip. .,.

202 Checking and filling
Checking the engine coolant level and
adding coolant
Be very careful when adding engine coolant.
Fi g. 1 77 En g in e c ompart men t: C over on the coola nt
ex pan sion ta nk
Fig. 178 Engine co mpar tment : ma rkin gs in th e coolant
ex pan sio n ta nk
Before you che ck anything in the engi ne com­
partment,
a lwa ys r ead and heed all WARN­
INGS c> A in Working in the engine compart ­
ment on page
195.
The "M IN " und "MAX " mark ings a re found o n
the bi -level disc in the in terior of the coolant
expansion tank
¢ fig . 178.
.,. Pa rk you r vehi cle on a level sur face .
.,. Turn off t he igni tion.
.,. Let the engine coo l down .
.,. Place a thick rag over the coolant expansion
tank and
c a refully turn the cap cou nte r­
clockwise
c> _&. .
.,. Read the eng ine coolant level inside the
coolant expans io n tank
c> fig . 177,
c>page 197 , fig. 174 . With a cold engine,
the coolant level sho uld be betwe en the
" M IN " and "MAX " ma rkings <=>
fig. 178
-arrows- . W he n t he eng ine is wa rm, the lev­
el may be slightly
above the "MAX" marking . .,.
Add coo lant mixed in the correct rat io, if
necessary
c> page 201 . Coolant may be a
maxim um of 1 mm above the MAX marking .
.,. Twist the cap on again
tightly.
The location of the coo lant expansion tan k
can be seen i n the engine compartment illus ­
tration
c> page 197.
T o obtain an acc urate reading, the engine
must be sw itched off.
T he ex pan sion ta nk in your vehicle is eq uipped
with an ele ctric coo lant level senso r.
When the coolant level is too low , the wa rn ing
li ght in the Au to-Check System <=>
page 17 will
blink u nti l yo u ad d coolant and the level has
been restored to normal. Eve n t hough t here i s
an e lectri c coo lant level senso r, we still rec ­
ommend you check the coola nt level from
time to t ime.
Coolant loss
Coolant loss may indica te a leak in the cooling
system. In t he event o f coolant loss, the coo l­
i ng system shou ld be inspected immediately
by your a uthorized Audi dea ler . It is not
eno ugh mere ly to add coolant.
In a
sealed sys tem, losses can occur on ly i f
the boili ng point o f the coo lant is exceeded as
a res ult of overheating.
Adding coolant
Rep la cement engine coo la nt must conform to
exact spe cificat ions
c> page 201, Cool ant .
We recommend using only coolant add it ive
Gl 2++ , Gl3 or in an emergency G 12 +. Do not
use a diffe rent add itive. In an emerge ncy use
plain w ater until yo u can get the correc t addi­
tive a nd can res tore the cor rect ra tio. T hi s
sho uld be done as soon as possib le .
If you have lost a considerab le amou nt of
c oolant , the n you shoul d a dd cold an tifreeze
and co ld wate r on ly w hen the e ng ine is cold.
Always use
n ew engine coo lant w hen refilling .
Do not f ill coo la nt
above the "MA X" mark. Ex-
cess coolant will be forced o ut through the .,,_