2014 AUDI S4 check engine light

30 Driver information display
Resetting the service interval display
Your authorized Audi dealer will reset the cor­
responding service schedule after performing
the appropriate service on yo ur vehicle . Yo u
also have the possibility to reset the oil
change schedule after having performed an
oil change according to Audi specifications.
Select
I CAR I function button > Service interval
display > Reset oil change interval
or ICARI
function button> Car systems* control but­
ton
> Servicing & checks > Reset oil change
interval.
(D Note
If you disconnect the battery terminals, no
calculations can be made for the serv ice
interval display during this time and no
service rem inder wi ll appear. Remember
that observing the proper service intervals
is vitally important to extend ing the life of
your vehicle, particu larly the eng ine, and
maintaining its value. Even if the mileage
driven is low, the maximum period of one
yea r from one service to the next must not
be exceeded .
@ Tips
-Do not reset the display between oil
changes, otherwise the display will be in­
correct.
- The information in the Service Reminder
r ema ins stored even when the vehicle
battery is disconnected.
On-Board Diagnostic
system (OBD)
Malfunction Indicator Lamp (MIL)
The Malfunction Indicator Lamp (MIL) ¢4' i n
the instrument cluster 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 engine starts and the idle has stabilized .
This indicates that the MIL is working proper­
ly.
If the light does not go out after the engine
is started, or illuminates while you are driv­
i ng, a malfunction may exist in the eng ine sys­
tem . If the light illuminates, the catalytic con­
verter could be damaged .
Continue driving
with reduced power (avoid­
ing sustained high speeds and/or rapid accel­
erations) and have the cond ition corrected.
Contact your authorized Audi dealer.
If the light il luminates, the electronic speed
limiter may also be malfunct ioning. For more
information
c:> page 31 , Electronic speed
limiter.
An improperly closed fuel filler cap may also
cause the
MIL light to illuminate
c:>page 212.
On-Board Diagnostics
Fig . 18 Locat io n of Data Link Con nector (D LC)
On-Board Diagnostics monitors the compo ­
nents of your emission control system . Each
monitored component in your engine system
has been assigned a code. In case of a mal­
function, the component will be identified
and the fault stored as a code in the control
module memory.
The MIL light may also illuminate if there is a leak in the on-board fuel vapor recovery sys­
tem. If the light illuminates after a refueling,
stop the vehicle and make sure the fuel filler
cap is properly closed
c:> page 212 .
In order to make an accurate diagnosis, the
stored data can on ly be displayed using spe­
c ial diagnostic equipment (generic scan tool
furOBD) .
~

34 Openin g 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 until the vehicle has come to a com­
plete stop. Otherwise the steering col­
um n loc k co uld suddenly e ngage -caus­
ing the risk of an accident.
@ Tips
- The operation of the remote contro l key
c a n be tempo rarily disrupted by in terfer­
ence from tran smi tters in t he v ici nity of
the 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
are on ly available from author ized Audi
dealer.
- For Decla ration of Compliance to United
States FCC and Industry Canada regu la­
tions
c:> page 2 78.
Removing the mechanical key
F ig . 20 Remote ma ster key : remov ing the mec hanic al
key
" Press the release button ® c:> fig. 20 .
"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 side ¢
page 65.
-lock and unlock the lockable* rear bench
seat and pass-through *
c:> page 69.
- activate the child sa fe ty locks on the rear
doors
c:> page 42 .
-lock and unlo ck the vehicle manu ally
¢
page 38 if this should not be possible
with the master key.
- use the ignition key emergency release
¢ page 35.
Check light and battery in the master
key
Fig . 2 1 Re mote mas te r ke y: r em ov ing th e batte ry hold­
e r
Check light in the master key
The check light@¢ fig. 21 in the master key
provides information about different condi­
t ions .
" The check light tu rns on br iefly once when a
button is pressed, and during an "inquiry"
by the convenience key system .
" If the check light does not come on, the bat ­
tery is dead a nd has to be replaced . In addi­
tion, when the batte ry is dead
the m indi­
ca to r li ght appears in the instr ument cluster
disp lay as well as the message
Plea se
change key battery .
Master key battery replacement
" Remove the mechan ica l key ¢ page 34 .
" Press the release button @ ¢fig. 21 on the
bat tery ho lde r and at the same time pull the
ba ttery holde r o ut o f the maste r key in the
di rection o f the arrow.
" Insta ll the new battery CR 2032 with the
"+ " sign facing down .
... Push the battery holder carefu lly into the
master key .

124 Homelin k
Homelink
Universal remote
control
Description
Appl ies to vehicles: wit h Homeli nk
The HomeLink universal remote control can
be programmed with the remote control for
devices that are already present.
W ith Home Link, you can control devices such
as the garage door, security systems, house lights, etc. comfortably from the inside of you
vehicle.
Homelink makes it possible for you to replace
three d ifferent remote controls from dev ices
in your home with one universal remote. This
feature works for most garage door and exte­
rior door motor signals. Programming the in­
div idual remote control for your remote con ­
trol takes place near the center of the radiator
grille. There is a control module attached at
this location .
A one -time programm ing of the sensor must
be performed before you are able to use sys­
tems with Home link. If the system does not
activate after performing the one-time pro­
gramm ing, check whether the system uses a
rolling code
q page 127 for vehicles without
the MMI*.
& WARNING
-
- Never use the Homelink transmitter
with any garage door opener that does
have not the safety stop and reverse fea­
ture as required by federa l safety stand­
ards. This includes any garage door open­
er model manufactured before April 1,
1982.
- A garage door opener which cannot de­
tect an object, signaling the door to stop
and reverse does not meet current feder­
al safety standards. Using a garage door
opener without these features increases
risk of serious injury or death. -
For safety reasons never release the
parking brake or start the engine while
anyone is standing in front of the vehicle.
- A garage door or an estate gate may
sometimes be set in motion when the
Homelink remote control is being pro­
grammed. If the device is repeatedly ac­
tivated, this can overstrain motor and
damage its e lectrica l components - an
overheated mo tor is a fire hazard!
- To avo id possib le injuries or property
damage, please always make abso lutely
certain that no persons or objects are lo­
cated in the range of motion of any
equipment being operated.
{D Tips
- If you would li ke more information on
Homel ink, where to purchase the Home­
Link compat ible prod ucts, or wou ld like
to purchase the Homelink Home Light­
ing Package, please call toll-free:
1-800-355-3515.
- For Declaration of Compliance to United
States FCC and Industry Canada regula­
tions
¢ page 2 78.
- For security reasons, we recommend that
you clear the programmed buttons be­
fore selling the vehicle.
Operation
Applies to veh icles : w it h Ho meli nk
~ ,.......,,...--, ........... ~
,;,,, r . o : o . ) .~
®
Fig. 136 Headl iner: controls
Requirement : The buttons must be program-
med
¢ page 125 or ¢page 126. II>

198 Driving and en vironm ent
Reducing unnecessary idling
Even when your car is just idling it burns up
fuel .
.,. Shut the engine off when you are not dr iving
the vehicle.
.,. Do not warm up the vehicle by letting the
engine run at idle .
It makes sense to shut
off the engine in traffic
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
burned s tarti ng 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 .
(D Note
Do not leave engine idling unattended af­
ter starting . If warning lights shou ld come
on to indicate improper operation, they
wou ld go unheeded. Extended idling also
produces heat, which cou ld result in over­
heating or other damage to the vehicle or
other property .
Regular maintenance
A badly tuned engine unnecessarily wastes a
lot of fuel .
... Have your vehicle serviced at regular inter-
vals.
By having your vehicle regularly serviced by an
authorized Audi dealer he lps to ensure that it
runs properly and economically . The condition
of your vehicle not only affects its safety and
ab ility to hold its value, it also affects
fuel
consumpt ion .
Check you r oil ea ch time you fill you r tank.
The amount o f oi l used is re lated to engine
load and speed.
It i s normal fo r the oil consump tion of a new
engine to reach its lowest value after a certa in
mileage has been d riven.
You must drive your veh icle about 3,000 m iles
(S,000 kilometers) before you can properly
assess oil consumpt ion.
T his also app lies to fue l consumption and en­
gine o utput.
(D Note
- Have your veh icle ma inta ined properly
and in acco rdance with the service rec­
ommendations in your Wa rranty
& Main­
t enance boo klet . Lack of p roper ma inte­
nance as well as improper use of the ve­
hicle will impair the function of the
emission contro l system and cou ld lead
to damage.
- Do not alter or remove any component of
the Emission Control System unless ap­
proved by the manufacturer.
-Do not alter or remove any device, such
as heat sh ie lds, switches, ign it ion w ires,
valves, which are designed to protect
your vehicle's Emission Control System and other important vehicle compo­
nents.
Fewer short trips
Fuel consumption will always be relatively
high on short trips .
.,. Try to avoid dr iv ing short distances w ith a
cold engine .
T he engine and cata lytic converter have to
reach their opt imal
operat ing temperature to
reduce fuel consumpt ion and nox ious emis­
s ions effectively .
Just after starting, a co ld eng ine in a mid-s ize
car only achieves a fuel economy of 6-8 m iles
per gallon (30-40 l/100 km). After about a
half a mile, fuel economy cl imbs to 12 mpg
(20 l/100 km) . After about
2 .5 miles (4 km), ll>

Trailer towing Driving with a trailer
General information
Your Audi was designed primarily for passen­
ger transportation .
If you plan to tow a tra iler, p lease remember
that the addit ional load will affect durab ility,
economy and performance .
T railer towing not on ly places more stress on
the vehicle, it also calls for more concentra­
tion from the driver.
F or this reason, a lways fo llow the operating
and driving instructions provided and use
common sense.
Technical requirements
Traile r hitch
Use a weight-carrying hitch conforming to the
gross trailer we ight. The hitch must be suita­
b le for your veh icle and trailer and must be
mounted secure ly on t he veh icle's chassis at a
technically sound location . Use only a t railer
h itch w ith a removab le ball moun t. A lways
check with the tr ailer hitch man ufac tur er to
make sure that you are using the correct
hitch.
Do not use a bumper hitch.
T he hitc h must be installed in such a way that
it does not inte rfe re with the impac t-absorb­
i ng b umper syst em. No modifica tions should
be made to the vehicle exhaus t and b rake sys­
tems . From t ime to time, check that a ll hitch
mo unt ing bolt s remain securely fas tened.
W hen you are not tow ing a trailer, remove the
trai le r hi tch ball moun t. T h is prevents the
hi tch from causing damage sho uld your ve hi­
cle be str uck from be hind
¢ &. .
Trailer brakes
If yo ur tra iler is equ ipped w it h a braking sys­
tem, check to be su re that it conforms to a ll
r eg ulat io ns.
Trailer towin g 201
The trailer hyd ra ulic bra ke system must not be
direct ly connected to the vehicle's hydraulic
brake system
¢ &. .
Safety chains
Alw ays use s afety chains between your ve hicle
and t he tra ile r.
Trailer lights
Tra ile r lights m ust meet all reg ulations . Be
su re to check w ith your authorized Audi dealer
fo r c orrec t w iri ng, sw itches, and relays.
Mirrors
If you a re unable to see the traffic behind you
u sing the regula r outside m irrors, then you
must insta ll ext ended mir ro rs. It is important
t h at you
always have clea r vis io n to the rear .
.8, WARNING
- If a trai ler has elec trica l br ake s plea se
no te th at t hese bra kes are not activat ed
by the fa ctory -fit ted control unit -risk of
accident!
- After removing the t railer hi tch, do no t
s to re it in yo ur vehicle . In case of sudden
brak ing, the hitch could fly fo rward and
in ju re you or yo ur passenge rs .
Operating instructions
Maximum traile r we ight
-
A trai ler fo r you r vehicle is limited to a typical
class 1 or class 2 tra iler.
Trailer load distribution
B e sure the lo ad in the tra iler is h eld secure ly
i n p lace to p reven t it from shifting fo rward,
backward or sideways.
Never allow a passenger to ride in a trailer
¢ &. in Driving instru ctions on page 20 2.
Engine cooling system
Towing a t railer ma kes t he engine wor k hard ­
er . It is impo rta nt that the cooling system's
perfo rman ce is up to the additional load.
Make sure tha t the coo ling sys tem h as enough
f lu id . .,..
•
•

202 Trailer towing
Tire pressure
When towing a trailer, inflate the tires of your
vehicle to the cold tire pressure listed under
"Full load" on the label located on the driver's
side B-pillar (visible when the door is open).
Inflate trailer tires to trailer and tire manufac ­
turers' specifications.
Lights
The headlight settings should be checked with
the trailer attached before driving off. Check
to make sure both vehicle and trailer lights
are working properly.
Safety chains
Be sure trailer safety chains are properly con­
nected from the trailer to the hitch on the ve­
hicle. Leave enough slack in the chains to per­
mit turning corners. When you install safety
chains, make sure they will not drag on the road when you are driving.
The chains should cross under the trailer
tongue to prevent it from dropping in case of
separation from the hitch.
Driving instructions
Driving with a trailer always requires extra
care and consideration.
To obtain the best possible handling of vehicle
and trailer, please note the following:
.,. Do not tow a loaded trailer when your car it­
self is not loaded.
.,. Be especially careful when passing other
vehicles.
.,. Observe speed limits .
.,. Do not drive at the maximum permissible
speed.
.,. Always apply brakes early.
.,. Monitor the temperature gauge.
Weight distribution
Towing a loaded trailer with an empty car re­
sults in a highly unstable distribution of
weight . If this cannot be avoided, drive at very
low speeds only to avoid the risk of losing
steering control. A "balanced" rig is easier
to operate and con­
trol. This means that the tow vehicle should be loaded to the extent possible and permissi­
ble, while keeping the trailer as light as possi­
ble under the circumstances. Whenever possi­
ble, transfer some cargo to the luggage com ­
partment of the tow vehicle while observing
tongue load requirements and vehicle loading
considerations.
Speed
The higher the speed, the more difficult it be­
comes for the driver to control the rig. Do not
drive at the maximum permissible speed. Re­
duce your speed even more if load, weather or
wind conditions are unfavorable -particularly
when going downhill.
Reduce vehicle speed
immediately if the trail­
er shows the slightest sign of swaying .
Do not
try to stop the swaying by accelerating.
Observe speed limits. In some areas, speeds
for vehicles towing trailers are lower than for
regular vehicles .
Always apply brakes early. When driving downhill, shift into a lower gear to use the en ­
gine braking effect to slow the vehicle . Use of
the brakes alone can cause them to overheat
and fail.
Coolant temperature
The coolant temperature gauge c> page 10
must be observed carefully . If the needle
moves close to the upper end of the scale, re­
duce speed immediately and/or turn off the
air conditioner.
If the coolant temperature warning light •
in the instrument cluster starts flashing, pull
off the road, stop and let the engine
idle for
about two minutes to prevent heat build-up .
_& WARNING
Anyone not properly restrained in a mov­
ing vehicle is at a much greater risk in an
accident. Never let anyone ride in your car
who is not properly wearing the restraints
provided by Audi.
-

214 Checking and filling
Checking and filling
Engine hood
Releasing and opening the engine hood
The engine hood is released from inside the
vehicle .
Fig. 180 Driver's side footwe ll: e ngin e hood release
lever
... -- - -=-
Fig. 181 Release lever u nde r the engine hood
Before opening the engine hood, make sure
that the windshield wipers are flat against the
windshield. Otherwise, they could damage the
pa int on the hood.
... Pull the release lever on the left under the
instrument panel in the direction of the ar­
row
c;, fig . 180.
... Raise the hood slightly r::;, .&,
... Press the rocker switch under the hood up­
ward
c;, fig . 181 . This releases the catch.
... Open the hood.
A WARNING
Hot engine coo lant can burn you.
- T o reduce the risk of being burned, never
open the hood if you see or hear steam
or coolant escaping from the engine
compartment. Wait until no steam or coo
lant 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
r::;, .&, .
A WARNING
-
A hood that is not completely latched
could fly up and b lock your view while driv­
ing.
- When you close the engine hood, check it
to make sure the safety catch has proper­
ly engaged . The hood shou ld be flush
with the surrounding vehicle body parts.
-If you notice while driving 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 is a risk of
injury , burns and accidents. To prevent per­
sonal injury always observe the following
WARNINGS. The engine compartment of any
vehicle is a hazardous area
r::;, ,&..
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); put manual trans­
mission in Neutral.
- Always let the engine cool down. Hot
components will burn skin on contact .

216 Checking and filling
Engine compartment
Engine compartment
These are the most important items that you can check.
Fig. 182 Typical layout for containers and eng ine o il filler cap
(D Eng ine o il filler cap ("1::::r.) . . . . . 219
@ Jump start point(+) under a cov-
er .. .. .... ... ....... .... ..
227,267
@ Bra ke fluid reservo ir (0)) . . . . . 224
@ Coolant expansion tank (-L) . . . 222
® Jump start point(-) with hex
head sc rew ..... .......... ..
227, 267
® W indshield/headlight* washer
. (" ') container o ....... . ... .. . 228
The pos ition o f the engine o il fi lling hole
¢ fig . 182 (item @) can differ depending on
the eng ine design.
A WARNING
Before yo u check anything in the engine
compartment, always read and heed all
WARNINGS ¢.&. in Working in the engine
compartment on page 214.
-
Engine oil
· Engine oil specifications
The engine in your Audi needs the right kind
of oil.
The eng ine in your Audi is a sophist icated
power plant that was b uilt to exacting specifi­
cations . Th is engine needs the right k ind of
engi ne oil that meets specifica tions regard ing
quality a nd v iscosity so that it can run
smooth ly and reliab ly. Choosing the rig ht o il
and changing oil within the t ime and mile age
i n tervals prin ted in you r vehicle's Warr anty
&
Maintenance booklet matters a lot more to ­
day tha n it did years ago . Aud i has deve loped
a spec ia l quality standard for engine oil that
will help assure that your vehicle 's engine w ill
get the lubr ication it needs for proper opera-
t ion . ..,_