check engine AUDI A7 2016 Owner's Guide

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Brake fluid
Checking brake fluid level
Fig. 192 Engine compa rtment : cove r on the brake f luid
reservoir
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Before you check anything in the engine compart­
ment,
always read and heed all WARNINGS
¢ A in Working in the engine comportment on
page 218.
.,. Read the brake fluid level from the brake fluid
reservoir
¢ fig. 192, ¢page 220, fig. 188. The
brake fluid leve l must be between the "MIN"
and "MAX" markings .
The location of the brake f luid reservo ir can be
seen in the engine compartment illustration
¢page 220.
The fl uid level may drop slightly after some time
due to the automatic adjustment of the brake
pads. This is not cause for alarm.
I f the brake fluid level falls
considerably below
the "MIN" mark, the brake warning/indicator
light
1111 (U .S. models)/ . (Canadian models)
will come on ¢
page 14. Do not cont inue to oper­
ate the vehicle . The complete brake system
should be thoroughly checked by an authorized
Audi dealer or other qualified facility and the cause corrected. If the brake fluid level is too low,
the brake warning/indicator light will illuminate.
Contact an authorized Audi dealer
immediately .
Changing brake fluid
Hove the broke fluid changed by on experienced
technician .
Brake fluid absorbs moisture from the air. If the
water content in the brake fluid is too high, cor-
Checking and Filling
rosion in the brake system may result after a peri­
od of time. The boiling point of the brake fluid
will also decrease considerably and decrease braking performance .
T herefore, the brake fluid must be changed
every
two years.
Always use new brake fluid which con­
forms to Federal Motor Vehicle Standard "FMVSS
116 DOT 4".
The brake fluid reservoir can be difficult to reach,
therefore, we recommend that you have the brake flu id changed by your authorized
Audi
dealer .
Your dea ler has the correct tools, the
right brake fluid and the know-how to do this for
you .
_&. WARNING
-.
- Brake fluid is poisonous . It must be stored
only in the closed original conta iner out of
the reach of children!
- Brake failure can resu lt from o ld or inappro­
p riate brake fluid. Observe these precau­
tions:
- Use only brake fluid that meets SAE speci­
fication
J 1703 and conforms to Federa l
Motor Vehicle Standard 116. Always check
with your authorized Audi dealer to make
sure you are using the correct brake fluid .
The correct type of brake flu id is also ind i­
cated on the brake fluid reservoir.
- The brake fluid must be new. Heavy use of
the brakes can cause a vapor lock if the
brake fluid is left in the system too long.
T his can seriously affect the efficiency of
the brakes as well as your safety. This
could result in an accident.
(D Note
Brake fluid will damage the paint of your vehi­
cle.
@ For the sake of the environment
Because of the problem of prope r disposal of
brake fluid as well as the special tools re­
quired and the necessary expertise, we rec­
ommend that you have the brake flu id
changed by your authorized Audi dealer.
227

Checking and F ill in g
Battery
General information
Under no rmal operating conditions, the battery
in your Audi does not need any ma intenance.
W ith
high outside temperatu res or long daily
d rives we recommend that you have the electro­
lyte level checked by a service facility . The elec­
trolyte level should a lso be checked each time
the battery is charged ¢
page 230.
Have the bat tery checked when you take yo ur ve­
hicle in for service . You are we ll advised to re­
p lace a battery that is o lder than 5 years .
W ith certa in types of airbag deploymen t, the bat­
tery is disconnected from the vehicle electrica l
system for safety reasons ¢
.&. in Repair, core
and disposal of the airbags on page 158.
Disconn ecting the battery t erminal s
Some veh icle funct ions (power window regula­
tors, for examp le) are lost if the battery termi ­
na ls are disconnected. These functions have to be
re learned after the battery terminals are con­
nected aga in. To prevent this, the battery shou ld
only be disconnected from the vehicle electrical
system when absolutely necessary for repairs.
Vehicl es not driven fo r long period s
If you do not drive your vehicle over a period of
several days or weeks, e lectrica l components are
gradually cut back or switched off. This reduces
energy consumption and maintains starting ca­ pability over a longer period¢
page 194. Some
of the convenience funct ions may not operate,
such as the inter ior lights or power seat adjust­
ment. The convenience functions will be ava ilab le
again whe n you swit ch on the igni tion and sta rt
the engine.
Winte r operation
During the winter months, battery capacity tends
to decrease as temperatures drop . This is because
mo re power is also consumed w hile starting, and
the head lights, rear w indow defogger, etc ., are
used more often.
Avoid unnecessary power consumption, part icu­
larly in city traffic or when traveling only short
228
distances. Let your authorized Audi dealer check
the capacity of the vehicle battery before winter
sets in
¢ page 230 . A well charged battery will
not only prevent starting problems when the
weather is cold, but will also last longer.
(D Tips
If your vehicle is left standing for several
weeks at extremely low temperatures, the ve­
hicle battery should be removed and stored
where it will not freeze . This will prevent it
from being damaged and having to be re­
placed.
Working on the battery
Be especially careful when working on or near
the battery.
The battery is located in the luggage compart­
ment under the floor . Before you check anything
i n the luggage compartment,
re ad and he ed all
WARNINGS ¢&, .
Always heed the safety warning s, when working
o n the vehicle battery or the vehicle e lectr ical
system to prevent injury .
The following WARNING S are very important
when working on the battery :
Alw ay s heed the following WARNING SYM ·
BOL S and safety p recaut ions when wo rking on
the batter y.
®
Alw ay s w ear e ye protection .
~
Battery acid contains sulfuric acid . Al -
way s wear gloves and ey e protection .
@
No
· spark s
· flames
· sm oking.
~
When a battery is charged , it p roduce s
h yd rogen gas which is e xplosi ve and
'
could cause per sonal injury .
®
Always keep the battery well out of
r ea ch of ch ild ren.
...

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A WARNING
-=
Whenever working on the battery or on the
electrical system, there is the risk of injury,
accident and even fire. Read and heed the fol­
lowing WARNINGS:
- Always wear eye protection . Do not let bat­
tery acid or any lead particles get on your skin or clothing. Shield your eyes. Explosive
gases can cause blindness or other injury .
- Battery acid contains sulfuric acid . Sulfuric
acid can cause blindness and severe burns.
- Always wear gloves and eye protection. Do
not tilt the battery because acid could leak
out of the ventilation openings.
- If you get battery acid in your eyes or on
your skin, immediately rinse with cold wa­
ter for several minutes and get medical at­
tention .
- If you should ingest any battery acid, seek
medical attention immediately .
- Do not expose the battery to an open flame, electric sparks or an open light.
- Do not smoke.
- Do not interchange the positive and nega-
tive cables.
- When working on the battery, be sure not to short-circuit the terminals with tools or oth­
er metal objects. This would cause the bat­
tery to heat up very quickly, which could
lead to damage or explosion and personal
injury .
- When a battery is charged, it produces hy­
drogen gas which is explosive and could
cause personal injury.
- Always keep the battery well out of the
reach of children .
- 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 .
-
Checking and Filling
-Before disconnecting the battery, switch off
the anti-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.
([) Note
-Do not disconnect the vehicle battery when
the ignition is on or when the engine is run­
ning, otherwise, you will damage electronic
components in the electrical system.
- If your vehicle is going to stand for a long
period of time without being driven, protect
the battery from "freezing", otherwise it
will be damaged and will then have to be re­
placed.
- When opening the doors, the windows low­
er approximately 10 mm automatically. This
function is not available when the battery is
disconnected, which means there is a risk
that the door seal or the window could be
damaged .
229

Checking and Fill in g
Battery charging
Starting the engine requires a well charged bat­
tery .
Fig. 193 Engine co mpartment : conn ectors for a charger
and jump start cable s
Always read and heed all WARN ING S below
<=:> &. and
<=:>&. in Working on the battery on
page 229 .
.,. Switch off the ignition and all electrical con­
sumers .
.,. Make sure the area is well vent ilated when yo u
charge the battery .
.,. Open the engine hood
¢ page 218.
.,. Open the red cove r on the posit ive po le
¢ fig. 193.
.,. Connect the charger connectors according to
the instructions to the
j ump sta rt bolts . (Bolts
under the red cover = "positive", Bo lts with hex
head= "negative") .
.,. Only now plug the mains lead for the charg ing
equipment into the wall outlet and turn it on
¢ &_ .
.,. Ma ke s ure the charging rat e is n ot ov er
3 0 amp s/14 .8 Volt .
.,. When the batte ry is fully charged: Turn the
charging equ ipment off and remove the mains
lead from t he wall outlet .
.,. Now remove the clamps for the charging equip-
ment .
.,. Close the red cover on the positive pole.
.,. Close the hood
c::> page 219 .
A discharged battery can freeze at temperatures
of only 32 F
0 (0 °C) . Allow a frozen battery to
thaw completely before attempting to charge it
c:> &. . However, we recommend not using a
thawed battery again because the batte ry casing
230
can be cracked due to ice formation and can leak
battery acid.
Battery charging (Maximum charging rate of
30 amps /14.8 Volt )
When charging at low voltages (e.g. with a trickle
charge r),
the battery cab les do not have to be
disconnected f irst. The battery caps should
not
be opened when charging a battery.
It is not necessa ry to remove the battery from
the luggage compartment, and it is a lso not nec­
essary to d isconnect the cab les.
Fast ch arging th e battery (cha rgin g ra te
above 14 .8 V olts)
For technical reasons do not use a battery charg­
er that uses vo ltage greater than 14.8 Vo lts to
charge your vehicle's battery.
A WARNING
Charging a battery can be dangerous.
- Always follow the operating instructions
provided by the battery charger manufactur­
er when charging your battery .
- Never charge a frozen battery. It may ex­
plode because of gas trapped in the ice . Al­
low a frozen battery to thaw out f irst .
- Do not reuse batteries wh ich were frozen.
The battery housing may have cracked and
weakened when the battery froze.
- Charge the battery in a well ventilated area.
Keep away from open flame or electrical
spark. Do not smoke. Hydrogen gas generat­
ed by the batte ry is explosive.
- To reduce the danger of explosion, never
connect or d isconnect charger cab les wh ile
the charger is operating.
- Fast cha rging a battery is dangerous and
should only be attempted by a competent
technician w ith the proper eq uipment .
- Batte ry acid that may spill during charging
should b e washed off with a solut ion of
warm wa ter and baking soda to neu tralize
t he acid.

M N <( (.J
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(D Note
Never use a fast charger as a booster to start
the engine . This w ill seriously damage sensi­
tive electron ic components, such as control
units, relays, radio, etc., as well as the battery
charger.
Battery replacement
The new battery must have the same specifica­
tions and dimensions as the original equipment
battery .
Intelligent energy management in your vehicle is
responsible for distributing the electrica l energy
throughout your vehicle
c:> page 194. The intell i­
gent energy management system will keep the
engine battery charged better than vehicles w ith­
out this system . To make sure the additional elec­
tr ical energy is available once again after you
have changed the battery, we recommend that
you install batteries of the same type and manu­ facture only (the same as those installed at the
time your veh icle was delivered). Specif ications
are listed on the battery housing. Your author­
ized dealer must code the battery in the energy
management system to enable you to use the en­
e rgy management functions correctly after re­
p lacing the battery.
The new battery must have the same capacity ,
voltage (12-volts), amperage, construction and plug sealing .
When installing the battery, make sure the igni­
tion and all electrical consumers are switched off.
Make sure the ventilation hose on the s ide of
the battery is connected, otherwise fumes or
battery acid can leak out.
- Vehicles with the Start-Stop-System* are equipped with a special cycle-proof AGM battery. Installing a different type of bat­
tery can cause problems in the vehicle elec­
trical system. When replacing the vehicle
battery, always install one with the same
specifications as the original battery.
Checking and Filling
{® For the sake of the environment
Because of the prob lem of proper disposal of
a battery, we recommend your authorized
Audi dealer change the battery for you. Bat­
teries contain sulfur ic acid and lead and must
always be disposed of properly in compliance
with all environmental regulations. Disposing
of vehicle batteries improperly is very danger­
ous to the environment.
Windshield/headlight
washer container
Fig. 194 Engine compa rtment: cover on the winds hie ld
and head lig ht* washer fluid reservoir
The washer fluid container is marked with the
symbol
ip on its cap c:>fig. 194, c:>page 220,
fig. 188.
.. Before you check anything in the engine com ­
partment,
always read and heed all WARN­
INGS c:> .&. in Working in the engine compart­
ment on page 218.
.. Lift the filler cap tongue to add washer fluid.
You can fill the container to the top .
.. Press the cap back onto the filler neck after fill-
ing the container .
You can find the reservoir
capacity in the table in
c:>page272.
Clean water should be used when filling up. If
possible, use soft water to prevent scaling on
washer jets. Always add a g lass cleaner solution
(with frost protection in the winter) . ..,.
231

Checking and F ill in g
CJ) Note
Do not mix engine coolant antifreeze or any
other add itives to fi ll up the windshie ld wash­
er rese rvoir.
232

M N <( (.J
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Replacing wheels
Before changing a wheel
Observe the following precautions for your own
and your passenger's safety when changing a
wheel .
.,. After you experience a tire failure, pull the car
well away from moving traffic and try to reach
level ground before you stop¢,& .
.. All passengers should
leave the car and move
to a safe location (for instance, beh ind the
guardrail) ¢ ,& .
.,. Engage the
parking brake to prevent your vehi­
cle from rolling unintentiona lly ¢,& .
.. Move
selector lever to position P ¢ ,& .
1> lfyou are towing a trai ler, unhitch the trailer
from your vehicle .
.,. Take the
jack and the spare tire out of the lug­
gage compartment
¢ page 253, ¢ page 254.
.,&. WARNING
You or your passengers could be injured while
changing a wheel if you do not follow these
safety precautions:
- If you have a flat tir e, move a safe distance
off the road. T urn off the engine, turn the
emergency flashers on and use other warn­
ing devices to alert other mo torists.
- Make sure that passengers wait in a safe
place away from the vehicle and well away
from the road and traffic.
- T o help prevent the vehicle from moving
sudden ly and possibly slipping off the jack,
always fully set the parking brake and block
the wheel diagonally opposite the wheel be­ ing changed. When one front wheel is lifted
off the ground, placing the Automatic Trans­
mission in P (Park) will
not prevent the vehi­
cle from moving.
- Before you change a wheel, be sure the
ground is level and firm . If necessary, use a
stu rdy board under the jack.
- Always store the vehicle tool kit, the jack
and the replaced tir e in the luggage com­
partment ¢
page 132.
Emergency assistance
{!) Tips
Before changing the whee l, you must activate
the jacking mode, so that the automat ic con­
trols for the Adapt ive Air Suspension* do not
make it more difficult to lift the vehicle with
the jack ¢
page 257 .
Changing a wheel
When you change a wheel , follow the sequence
described below step-by-s tep and in exactly tha t
order .
l. Activate the vehicle jack mode* ¢ page 2 5 7.
2. Remove the
decorative wheel cover*. For
more details see also¢
page 256, Decora ­
tive wheel covers
or¢ page 256, Wheels
with wheel bolt caps .
3. Loosen the wheel bolts ¢page 256.
4. Locate the pro per mounting point for the
jack and align the jack be low that point
¢page 257.
5. Raise the car with the jack¢ page 257 .
6. Remove the wheel with the flat tire and then
install
the spare ¢ page 259.
7. Tighten all wheel bolts ligh tly.
8.
Lower the vehicle with the jack .
9. Use the wheel bolt w rench and
firmly tighten
all wheel bolts¢
page 256 .
10. Replace the decorative wheel cover*.
11. Deactivate the vehicle jack mode* in the
MMI :
ICAR I funct ion button > (C ar)* systems
control button > Servicing & checks > Air
susp.: jack mode > Off .
The vehicle jack mode* switches off automatically
at speeds above 6 mph (10 km/h) .
.,&. WARNING ~ -
Always read and follow all WARNINGS and in ­
formation ¢
.& in Raising the vehicle on
page 258
and ¢ page 260.
255

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Emergency situations
General
This chapter is intended for trained emergency
crews and working personnel who have the nec­
essary tools and equipment to perform the se
operations.
Starting by pushing or
towing
(D Note
Vehicles w ith an automatic transmission can­
not be started by push ing o r tow ing.
Starting with jumper
cables
If necessary, the engine can be started by con­
necting it to the battery of another vehicle .
If the engine should fail to start because o f a dis­
charged or weak battery, the battery can be con­
nected to the battery of
another vehicle, us ing a
pair of jumper cables to start the engine .
Jumper cables
Use only jumper cables of sufficiently large cros s
section
to carry the starter current safe ly. Refer
to the manufacturer's specifications.
Use only jumper cables with
insulated term inal
clamps which are distinctly marked:
plus(+) cable in most cases co lored red
minus (-) cable
in most cases colored black .
A WARNING
Batteries contain electricity, acid, and gas .
Any of these can cause very ser ious or fatal in­
jury . Fo llow the instructions be low for safe
handling of your vehicle's battery.
- Always shield your eyes and avoid leaning
over the battery whenever possible.
- A discharged battery can freeze at tempera­
tures just below 32 °F (0 °C) . Before con­
necting a jumper cable, you must thaw the
Emergency situations
frozen battery completely, otherwise it
could explode .
- Do not allow battery acid to contact eyes or
skin. Flush any contacted area with water immediately.
- Improper use of a booster battery to start a
veh icle may cause an explosion.
- Vehicle batteries generate explosive gases .
Keep sparks, flame and lighted cigarettes
away from batteries.
- Do not try to jump start any vehicle with a
low acid level in the battery.
- The voltage of the booster battery must al ­
so have a 12-volt rating. The capacity (Ah) of
the booster battery should not be lower
than that of the discharged battery. Use of batteries of different voltage or substantial­
ly different" Ah" rating may cause an explo­
sion and personal injury.
- Never charge a frozen battery . Gas trapped
in the ice may cause an explosion .
- Never charge or use a battery that has been
frozen . The battery case may have be weak­
ened ,
- Use of batter ies of different voltage or sub­
stantially different capacity (Ah) rating may
cause an exp losion and injury. Th e capacity
(Ah) of the booste r battery should not be
lower than that of the discharged battery.
- Before you check anything in the engine
compartment, always read and heed a ll
WARNINGS
q page 218 .
(D Note
-Applying a h igher voltage booster battery
w ill cause expensive damage to sensitive
electronic components, such as control
units, relays, radio, etc.
- Th ere must be no ele ct rical contact between
the vehicles as otherwise current could al­
ready start to flow as soon as the positive
(+) termina ls are connected.
(D Tips
The discharged battery must be properly con-
nected to the vehicle's e lectrical system. .,..
265

Emergency situation s
When jump sta rting or charging the battery,
never connect the negative ground cable to
the batte ry negat ive post because the battery
manager system must be able to detect the
battery's state of c harge. Always connect the
negat ive grou nd cab le to the negative ground
post of the batte ry manager control unit .
Use of jumper cables
Make sure to connect the jumper cable clamps in
ex actly the order described below!
F ig . 215 Eng ine co m pa rt m ent: con nec tors for ju mp star t
cab les a nd cha rge r

® .--l @
Fig . 2 16 Jum p start ing w it h t he bat te ry of a not her ve hicl e:
@-boos te r ba ttery , @ -disc harg ed v eh icle batt ery
The procedure described be low for con necting
jumper cables is intended to p rovide a jump start
for your ve hicle.
Vehicle with discharged battery: •T urnoff lig ht s and accesso ries , move lever of
automat ic transmiss ion to N (Ne utra l) or P
(Park) and set parking brake.
Connect POSITIVE(+) to POSITIVE(+) (red)
• Open the red cove r o n t he po sit ive termin al
~fig . 2 15.
266
1. Connect one end o f the red positive ca ble on
the
jump start bolt ~ fig. 216 /J) (bolt under
the red cover = "positive") of the vehicle to be
started @.
2. Connect the other end to the positive termi-
nal@ of the booster battery @.
Connect NEGATIVE (-) to NEGATIVE (-)
(black )
3. Co nnect one end of the black negative cable
to the negative term inal ® of the booste r
batte ry @ .
4 . Connect th e other end to the
jump start pin
@ (bolts w it h hex head bolt = "negative") of
the veh icle to be s tarte d@ .
Starting the engine • Sta rt the engine of the veh icle with the booster
bat tery @. Run the eng ine at a moderate
speed.
• Sta rt engine w it h discha rged vehicle ba ttery @
i n t he usual man ner.
• If the engine fails to start, do not keep the
starter cra nking for lo nger than 10 seco nds .
Wait for about 30 seconds and then try again .
• With engine running , remove jumper cab les
from both vehicles in the exact
reverse order .
• Close the red cover on the positive term inal.
The batt ery is vented to the o utside to prevent
gases from enter ing the vehicle inter ior. Make
su re that t he jumper clamps are well connected
with their metal parts in full contact w ith the
batte ry terminals.
&_ WARNING
To avoid se rious personal injury and damage
to the veh icle, heed all war nings and inst ruc­
tion s of the jumper cable m anufa cture r.
If in
d oubt, cal l for ro ad service.
- Ju mpe r cabl es must be lo ng enoug h so tha t
t he vehicles do no t tou ch.
- When conne cting jumper cables, make sure
th at they c an not get c aug ht in any moving
p art s in the engine com partmen t.
- B efore you check any thing in the e ngine
comp artment, alw ays re ad an d hee d all
WAR NINGS
~ page 218.

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(D Note
Improper hook-up of jumper cables can ruin
the generator.
- Always connect POSITIVE( +) to POSITIVE
( + ), and NEGATIVE( -) to NEGATIVE(-)
ground post of the battery manager control
unit.
- Check that all screw plugs on the battery
cells are screwed in firmly. If not, tighten
plugs prior to connecting clamp on negative
battery terminal.
- Please note that the procedure for connect­
ing a jumper cable as described
above ap­
plies specifically to the case of your vehicle
being jump started. When you are giving a
jump sta rt to another vehicle, do
not con­
nect the negative(-) cab le to the negative
( - ) terminal on the discharged battery @
r:::;, fig. 216. Instead, secure ly connect the
negative(-) cab le to either a solid metal
component that is firm ly bolted to the en­
gine block or to the engine block itself. If
the battery that is being charged does not
vent to the outs ide, escap ing battery gas
could ignite and explode!
Towing with a tow truck
General hints
Your Audi requires special handling for towing.
The follow ing information is to be used by com­
mercial tow truck operators who know how to op­
erate their eq uipment safe ly.
- Never t ow your Audi. To wing will cau se da m ­
age to the engine and tran smi ssion .
- Neve r wrap th e safety cha in s or win ch cab le s
around the brake line s.
- To pre vent unnecess ary dama ge, your A udi
mu st b e trans port ed w ith a fl at b ed t ru ck .
- To lo ad the vehicle on to th e flat bed, us e the
towing l oop found in th e vehicle tool s and at­
tach to th e fr ont or re a r anc hora ge
¢ page 267 and ¢page 268.
Emergen cy situati ons
A WARNING
-A veh icle being towed is not safe for passen-
gers. Neve r all ow anyone to ride in a vehicle
being towed, for any reason .
Front towing loop
Fig. 217 Fro nt bumper: cover
Fig . 2 18 Fro nt bumper : insta lling the tow ing loop
The threaded opening for the towing loop is lo­
cated behind a
cover on the right side of the front
bumper .
.,. Remove the towing loop from the vehicle tool
kit¢
page 253.
.,. Press the lower area of the cap inward with
quick, strong pressure
r::;, fig . 217 . The cap w ill
loosen from the bumper .
.,. Tighten the towing loop in the threaded open­
ing until it stops
¢ fig. 218 and then tighten it
w ith a wheel wrench .
.,. After using, p lace the towing loop back in the
vehicle tool k it.
A WARNING
--
If the towing loop is not tightened until it
stops when installing, the threads may be
267