2018 AUDI A4 check engine light

areas, into open streams or down sewage
drains.
- Recycle used engine oil by taking it to a used
engine oil collection facility in your area, or
contact a service stat ion .
Cooling system
Coolant
The engine coo ling system is filled with a mixture
of purified water and coolant additive at the fac­
tory. This coolant must not be not changed.
The coolant level is monitored through
the. in­
dicator light
¢ page 30. However , we do recom­
mend occasiona lly checking the coolant level
manually.
If you must add coolant, use a mixture of water
and coolant addit ive. Mixing the coolant additive
with distilled water is recommended.
Coolant additive
The coolant additive is made of anti -freezing and
corrosion protection agents. Only use the fol low­
ing coolant additives . These additives may be
mixed with each other.
Coolant additive Specification
G13
TL 774 J
G12++ TL
774 G
The amount of coo lant additive that needs to be
mixed with water depends on the climate where
the vehicle will be operated. If the coolant addi­
tive percentage is too low, the coolant can freeze
and damage the engine.
Coolant Freeze protec-
additive tion
Warm min . 40% min. -13 °F
regions max .
45% (
- 25 °()
Cold min.
50% max
. -40 °F
regions max.
55% (-40 °()
(D Note
-
Before the start of winter, have an author­
ized Audi dealer or authorized Audi Service
Facility check if the coolant additive in your
Checking and Filling
vehicle matches the percentage appropriate
for the climate. This is especia lly important
when driving in colder climates.
- If the appropriate coo lant additive is not
available in an emergency, do not add any
other additive. You could damage the en­
gine. If this happens, only use water and re­
store the correct mixture ratio with the
specified coolant add itive as soon as poss i­
ble .
- Only refill w ith new coolant.
- Radiator sealant must not be mixed with
the coolant.
Adding coolant
Fig. 270 E ngine compartment: re lease button on coolant
expansion tank
Observe the safety precautions ¢,&. in Working
in the engine compartment on page 323.
Checking the engine coolant level
.. Park the vehicle on a level surface .
.. Switch the ignition off .
.. Read the coolant level on the coolant expansion
tank
¢ fig. 270.
.. The coolant level must be between the MIN and
MAX markings when the engine in co ld. When
the engine is warm it can be slightly above the
MAX marking.
Adding coolant
.. Let the eng ine cool down .
.. Place a cloth over the coolant expansion tank
cap .
.. Push the release button ¢ fig. 2 70 and carefu l­
ly unscrew the cap to the left until you feel re-
sistance¢ ,A. IIJ,-
329

Checking and Filling
Charging the vehicle battery
Fig. 272 Engine co mpa rtment : connec tors for a c harger
and jump start cab le s
Req uirement: only use chargers with a m aximum
c hargi ng vo lta ge of 30 amp s/14.8 Volt s.
The
vehicle battery cables remain connected .
.,. Read the warnings c> .&. in General warnings
about batteries on page 331
and c> ,&. .
.,. Switch off the ignition and all electrical equip ­
ment .
.,. Open the hood 9 page 324 .
.,. Open the red cover on the positive terminal
c>fig. 272 .
.,. Clamp the charger terminal clamps to the jump
s ta rt pin s
according to the instruct ions . (pin
under the red cover = "positive ", p in with hex­
agonal head= "negative ") .
.,. Inse rt the powe r cable for the charg ing device
i nto the socke t and switch the dev ice on .
.,. At the end of the charging process , switch the
charger off and pull the power cab le out of the
socket .
.,. Remove the charger terminal clamps.
.,. Close the red cover on the positive terminal.
.,. Close the hood c> page 324 .
A WARNING
-A highly explosive mixtu re of gases can form
when cha rging batter ies. On ly charge the
vehicle batte ry in well-ven tilated areas.
- A drai ned vehicle battery can freeze at tem­
peratu res a round 32
QF (0 QC). A froze n or
thawed veh icle bat tery must not be charged
and must not be used anymore. The ba ttery
housing can crac k and battery acid can leak
o ut if ice forms, wh ich increases the r isk of
an exp losion and chemical burns. Contact an
332
author ized Audi dealer or authorized A udi
Service Facility for more information.
- Do not connect or disconnect the charging
cable whi le charging because this increases
the risk of an explos ion.
@ Tips
- Only charge the vehicle battery t hrough the
connect ions in the engine compartme nt.
- Read all of the manufacturer's instructions
for the charger before charging the vehicle
battery.
Windshield washer system
Fi g. 2 7 3 Engine compar tm ent: washer flui d res ervoir cap
The windshield washer fluid reservoir¢ contains
t he cleaning solution for the windshield and th e
headlight washer system *
c> page 325, fig. 268 .
The reservoir capaci ty can be found in
c> page 381.
To reduce the risk of lime scale deposits on the
spray no zzles, use clean water with low amounts
of calcium . Always add w indow cleaner to the wa­
ter . When the outside temperatures are cold, an
anti -freezing agent should be added to the water
so that it does not freeze .
(D Note
-The concentration o f ant i-freez ing agent
must be adjusted to the ve hicle operat ing
conditions in the respective climate . A con­
cent ration t hat is too high can lead to vehi­
cl e damage.
- Never add radiator anti-freeze or other addi­
t ives to the washer fluid.

Emergency situations
Emergency situations
General
This chapter is intended for trained emergency crews and working personnel who have the nec­
essary tools and equipment to perform these
operations.
Starting by pushing or
towing
(D Note
Vehicles with an automatic transmission
cannot be started by pushing or towing.
Starting with jumper
cables
If necessary, the engine con be started by con­
necting it to the battery of another vehicle.
If the engine should fail to start because of a dis­
charged or weak battery, the battery can be con­
nected to the battery of
another vehicle, using a
pair of jumper cables to start the engine.
Jumper cables
Use only jumper cables of sufficiently large cross
section
to carry the starter current safely. Refer
to the manufacturer's specifications.
Use only jumper cables with
insulated terminal
clamps which are distinctly marked :
plus(+) cable in most cases colored red
minus(-) cable
in most cases colored black.
A WARNING
Batteries contain electricity, acid, and gas.
Any of these can cause very serious or fatal in­
jury. Follow the instructions below for
safe
handling of your vehicle's battery.
-Always shield your eyes and avoid leaning
over the battery whenever possible.
-A dead battery can freeze at temperatures
around 32 °F (0 °C) . If the vehicle battery is
frozen, you must thaw it before connecting
the jump start cables.
If you do not, this in-
374
creases the risk of an explosion and chemi­
cal burns. After jump starting the vehicle,
drive to an authorized Audi dealer or author­ ized Audi Service Facility immediately to
have the vehicle battery checked.
- 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
vehicle 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 also
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 batteries of different voltage or sub­
stantially different capacity (Ah) rating may
cause an explosion and injury. The capacity (Ah) of the booster battery should not be
lower than that of the discharged battery.
- Before you check anything in the engine
compartment, always read and heed all
WARNINGS
r=:> poge 323.
([) Note
-Applying a higher voltage booster battery
will cause expensive damage to sensitive electronic components, such as control
units, relays, radio, etc.
- There must be no electrical contact between
the vehicles as otherwise current could al­
ready start to flow as soon as the positive
(+) terminals are connected.

a co .... N ,....
N .... 0 0
3 co
@ For the sake of the environment
-Changing the engine settings wi ll adversely
affect emission leve ls. Th is is detrimental to
the env ironment and increases fuel con­
sumption.
- Always observe environmental regu lations
when disposing of old engine o il, used brake
flu id, d irty engine coolant, spent batteries
or worn out tires .
- Undeployed airbag modules and pretension­
ers might be classified as Perchlorate Mate­
rial -spec ial handling may apply, see
www .dtsc.ca.gov/hazardouswaste/perchlo­
rat e. When the vehicle or pa rts of the re­
straint system including airbag modules
safety be lts with pretens ioners are scrap­
ped, a ll applicab le laws and regulations
must be observed. Your a uthorized Audi
dealer is familiar with these requirements
and we recommend that you have your deal­ er perform this service for you.
Accessories and
technical changes
Additional accessories and parts
replacement
Always consult on authori zed Audi dealer before
purchasing accessories.
Audi vehicles that are constructed w ith advanced
materials like Steel/Aluminum (Hybrid construc­
tion), Aluminum (Audi Space Frame), and/or Alu­ minum/Carbon Fiber (Ultra Advanced Light
We ight Materials) are as unique as the ir drivers .
Therefore, the ava ilability of certain parts needed
for repair , restoration , or reconstruction wi ll be
restricted , or parts will be unava ilable, if the ve­
hicle is not repaired at an a uthorized Audi colli­
sion repair facility. This includes but is not limit­
ed to structura l parts which require specialized
training and equipment to restore their crash ­
worthiness back to the original NHTSA and IIHS performance.
Your vehicle incorporates the latest safety design
features ensuring a high standard of active and
passive safety.
Consumer Inf ormation
This safety could be compromised by non-ap ­
proved changes to the vehicle. For this reason, if
parts have to be rep laced, please observe the fol­
lowing points when install ing additional accesso­
ries:
Approved Audi accessories and genuine Audi parts are avai lab le from authorized Aud i dea lers.
T hese dea le rs also have the necessa ry facilities,
tools and trained specialists to install the parts
and accessories properly .
A WARNING
-Using the wrong spare parts or using non-ap-
proved accessories can cause damage to the
vehicle and serious personal injury.
- Use on ly accessories expressly approved by
Aud i and genuine Audi spare parts
- These parts and accessor ies have been spe­
cially designed to be used on your vehicle.
- Do not use license plate brackets in the
front area that are different from the one
installed at the factory, or add additional
li­
cense plate brackets.
- Never install accessor ies such as telephone
cradles or beverage holders on airbag covers
or w ith in the airbag deployment zones . Do­
ing so will increase the risk of injury if a ir­
bags are triggered in an accident!
- Before you check anyth ing in the engine
compartment, always read and heed all
WARNINGS
9poge 323.
(D Note
- If items other than genu ine Audi spare
parts, add -on equipment and accessory
items are used or if repair work is not per­
formed according to specified methods, this
can result in seve re damage to your vehi­
cle's engine and body (such as corrosion)
and adversely affect your vehicle's warranty.
- If emergency repa irs must be performed
elsewhere, have the vehicle exam ined by an
authorized Audi dealer as soon as possib le .
- The manufacturer cannot be held liable for
damage which occurs due to failure to com­
ply with these stipulations .
385

Index
Audi p re sense . . . . . . . . . . . . . . . . . . . . . . . 120
Messages . . . . . . . . . . . . . . . . . . . . . . . . . . 124
Sett ings . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
Aud i Serv ice Repair Ma nuals and Literature 383
Aud i side assist . . . . . . . . . . . . . . . . . . . . . . . 128
Aud i smartphone interface . . . . . . . . . 246, 250
Aud i virt ua l cockp it
refer to Instr ume nt cl uster . . . . . . . . . . . . . 10
AUTO Automatic headlights . . . . . . . . . . . . . . . . . 54
Auto Lock (centra l locki ng system) . . . . . . . . 37
Automatic belt ret ractor . . . . . . . . . . . . . . . 266
Automatic climate control . . . . . . . . . . . . . . . 76
Aud i drive select. . . . . . . . . . . . . . . . . . . . . 134
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Automatic climate control system Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Automatic transm ission . . . . . . . . . . . . . . . . . 9 1
E me rgency prog ram . . . . . . . . . . . . . . . . . . 96
Hill descent contro l . . . . . . . . . . . . . . . . . . . 94
Kick -down . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Launch control program . . . . . . . . . . . . . . . 95
Manual sh ift ing . . . . . . . . . . . . . . . . . . . . . . 94
Parking lock emergency re lease . . . . . . . . . 97
Selector lever pos itions . . . . . . . . . . . . . . . . 91
Automatic wipe/wash system . . . . . . . . . . . . 60
Auto Safety Hotline . . . . . . . . . . . . . . . . . . . 26 1
AUTO (button) Automatic climate control . . . . . . . . . . . . . . 78
Auxiliary heater (automatic climate control) 79
AUX input . . . . . . . . . . . . . . . . . . . . . . . . . . . 234
Average consumption . . . . . . . . . . . . . . . . . . . 17
Ave rage spee d . . . . . . . . . . . . . . . . . . . . . . . . 17
B
BACK button . . . . . . . . . . . . . . . . . . . . . . . . . 155
Balance (sound) . . . . . . . . . . . . . . . . . . . . . . 252
Bass (sound) . . . . . . . . . . . . . . . . . . . . . . . . . 252
Ba tte ry
J u mp starting . . . . . . . . . . . . . . . . . . . . . . . 374
also refer to Veh icle bat tery . . . . . . . . . . . 33 1
Before driving . . . . . . . . . . . . . . . . . . . . . . . . 254
Belt tensione rs . . . . . . . . . . . . . . . . . . . . . . . 269
Blended gasoline . . . . . . . . . . . . . . . . . . . . . 315
Blower (automatic cl imate control) . . . . . . . . 78
388
B luetoot h
Audio player . . . . . . . . . . . . . . . . . . . . . . . . 230
Connect ing a cell phone . . . . . . . . . . . . . . 175
Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . 2SO
Boost...... .. .. .. .. .. ............. ... 11
Booster seats . . . . . . . . . . . . . . . . . . . . . . . . 305
Boost pressure indicator . . . . . . . . . . . . . . . . 11
B rake fl uid
Check ing the b rake fluid level . . . . . . . . . . 330
Brakes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
Brake ass ist . . . . . . . . . . . . . . . . . . . . . . . . 146
B rake fl uid . . . . . . . . . . . . . . . . . . . . . . . . . 330
El ec trome chanical parking b rake . . . . . . . . 88
E mergency b raking function . . . . . . . . . . . . 88
New brake pads . . . . . . . . . . . . . . . . . . . . . 149
Worn brake pads . . . . . . . . . . . . . . . . . . . . . 33
Breaking in New bra ke pads . . . . . . . . . . . . . . . . . . . . . 149
New engine . . . . . . . . . . . . . . . . . . . . . . . . . 80
New t ires . . . . . . . . . . . . . . . . . . . . . . . . . . 3 41
Browser
refer to M edia center . . . . . . . . . . . . . . . . . 237
Bu lbs ............................... 373
Buttons Cont ro l panel (M MI) . . . . . . . . . . . . . . . . . 155
Multifunctio n steering whee l . . . . . . . . 13, 16
P rogramming (multifunction steering
whee l) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
C
Cable ( USB adapter/AUX connector cab le) 233
Californ ia Pr opos ition 65 Wa rning . . . . . . . 3 24
Battery specific . . . . . . . . . . . . . . . . . . . . . 331
Call list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178
Call options . . . . . . . . . . . . . . . . . . . . . . . . . . 185
Capacities AdBl ue ... .. .. .. .. .. ... .......... .. 319
Fuel t ank . . . . . . . . . . . . . . . . . . . . . . . . . . . 381
Washer fluid reservoir . . . . . . . . . . . . . . . . 381
Care . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 354
Cargo area
refer to Loading the luggage compart-
ment .............................. 259
C atalytic converter . . . . . . . . . . . . . . . . . . . . 322
CD d rive (med ia d rives) . . . . . . . . . . . . . . . . 229

a co .... N ..... N .... 0 0
3 co
Emergency call f unction
Au di connect emergency ca ll and service . 202
E me rgency flashe rs . . . . . . . . . . . . . . . . . . . . 56
Emergency starting . . . . . . . . . . . . . . . . . . . 374
E m issions cont rol sys tem . . . . . . . . . . . . . . 32 2
E nergy management . . . . . . . . . . . . . . . . . . 151
Eng ine
Coolant . . . . . . . . . . . . . . . . . . . . . . . . . . . . 329
Start/Stop system . . . . . . . . . . . . . . . . . . . . 85
Starting/stopping . . . . . . . . . . . . . . . . . . . . 83
Starting w it h jumper cables . . . . . . . . . . . 374
Eng ine compartment . . . . . . . . . . . . . . . . . . 323
Opening and clos ing the hood . . . . . . . . . . 324
Safety precautions . . . . . . . . . . . . . . . . . . . 323
E ng ine oi l . . . . . . . . . . . . . . . . . . . . . . . . . . . 325
Adding . ... ... .. .. ..... ... .. .. .... . 327
Changing . . . . . . . . . . . . . . . . . . . . . . . . . . 328
Checking the oil leve l . . . . . . . . . . . . . . . . . 327
Consumption . ............. .. .. .... .
D. t· k lpS IC .. ... ............. ...... ... .
327
327
O il consumption . . . . . . . . . . . . . . . . . . . . . 326
Specification and viscos ity . . . . . . . . . . . . . 325
T empe rature d isp lay . . . . . . . . . . . . . . . . . . 11
Eng ine sound . . . . . . . . . . . . . . . . . . . . . . . . 134
Eng ine Start/Stop mode
refer to Start/Stop system . . . . . . . . . . . . . 87
E nter ing cha racters/numbers (speller) . . . . 162
Enter ing letters (speller) . . . . . . . . . . . . . . . 162
E n terta inment s liding me nu . . . . . . . . . . . . 160
E ntry/ex it lighting . . . . . . . . . . . . . . . . . . . . . 56
Environment Proper disposal of drained engine o il ... .
Unleaded fuel . .. ........... .. .. .... .
E S C
.. .. .. .. ... .. .. ..... ... .. .. .... .
Hill descent assist ... .... ... .. .. .... .
Offroad mode ... .. .. .... ... .. .. .... .
Sport mode 328
315
1 46
148
147
147
E v asive steering suppo rt . . . . . . . . . . . . . . . 12 1
Event Data Recorder (EDR) . . . . . . . . . . . . . 153
Expanded view . . . . . . . . . . . . . . . . . . . . . . . . 1 5
E xterio r ligh ting . . . . . . . . . . . . . . . . . . . . . . . 54
Exterior mirrors . . . . . . . . . . . . . . . . . . . . . . . 58
E xternal voice operat ion.... ... .. .. .... . 173
Index
F
Factory default settings
Multi Media Interface . . . . . . . . . . . . . . . . 249
Fader (sound) . . . . . . . . . . . . . . . . . . . . . . . . 252
Fastening Booster seats . . . . . . . . . . . . . . . . . . . . . . . 305
Convertib le child safety seats . . . . . . . . . . 303
I n fan t seats . . . . . . . . . . . . . . . . . . . . . . . . 301
Fast forwarding/rewind ing (a udio/video
file) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 236
F ast forwarding ( aud io/v ideo file) . . . . . . . . 236
Fast route
Favorites Media 211
239
Navigation . . . . . . . . . . . . . . . . . . . . . . . . . 206
Telephone. . . . . . . . . . . . . . . . . . . . . . . . . . 180
F ile formats (media drives) . . . . . . . . . . . . . 242
Floor ma ts ..... ... .. ................ .
Foot peda ls . .... .. ................. . . 259
259
F o r the s ake o f th e e nv ironmen t
E nvironmenta lly-friend ly driving . . . . . . . . 80
Fueling . . . . . . . . . . . . . . . . . . . . . . . . . . . . 317
Leaks ... .. .... .. .. ... .. ..... ... .. .. 324
Warming up the engine . . . . . . . . . . . . . . . . 83
F ree text search . .. .. .. .
............ ..
Media .. .. .... .. .. .... . ..... ... .. ..
Navigation .... .. ... .. .. ..... ... .. . .
Radio
. . .. .. ' . .. .. ... .. ..... ... .. . .
Telephone . .... .. ................. . .
F ree ze p ro tect ion 164
2 38
205
223 184
Coo lant . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 9
Freq uency band . . . . . . . . . . . . . . . . . . 222, 225
Front airbags Desc ription . . . . . . . . . . . . . . . . . . . . . . . . . 275
How they work . . . . . . . . . . . . . . . . . . . . . . 281
F rontal collisions and the laws o f physics . . 264
Front passenger 's doo r eme rgency locking . . 42
Front seats Adjusting . . . . . . . . . . . . . . . . . . . . . . . . . . 256
Child restra ints in the front seat . . . . . . . . 272
also refer to Seats . . . . . . . . . . . . . . . . . . . . 65
Fuel Additives
.. .... .. ................. .. 315
B lended gasoline . . . . . . . . . . . . . . . . . . . . 315
Current consumpt io n . . . . . . . . . . . . . . . . . .
17
D iesel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 315
391