check engine AUDI A4 2018 Service Manual

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@ 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

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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