2013 AUDI A4 SEDAN check engine light

The location of the coolant expansion tank
can be seen in the engine compartment illus­
tration
q page 217 .
To obtain an accurate read ing , the eng ine
must be switched off .
The expa nsion tank in you r vehicle is equipped
with an elec tric coolant level sensor.
When the coolant level is too low, the warning
light in the Auto-Check System
q page 18 wi ll
b lin k until you add coo lant and the level has
been restored to norma l. Even t hough the re is
an e lec tric coolant level sensor, we s till rec ­
ommend you check the coolant leve l from
time to time .
Coolant loss
Coolant loss may indi cate a leak in the coo ling
sys tem. In the event of coolant loss, the cool­
ing system should be inspected immedia tely
by your authorized A udi dealer. It is not
enough merely to add coolant.
I n a
s ealed system, losses can occur only if
the boiling point of the coolant is exceeded as
a result of overheating.
A WARNING
The cooling system is unde r press ure and
can get ve ry hot. Reduce the risk of sca ld­
ing from hot coolant by following these
steps.
- Turn off the engine and allow it to coo l
down.
- Protect yo ur face, hands and arms from
escaping fluid and steam by covering the
cap with a large, thick rag.
- Turn the cap slowly and very carefu lly in
a counter-clockwise direction wh ile ap­
plying light, downward pressure on the
t op of the cap .
- To avoid being bu rned, do not spill ant i­
freeze or coo lant on the exhaust system
o r hot eng ine parts . Unde r certai n condi­
t ions, the ethy lene g lycol in engine cool­
an t ca n catc h fire.
Checkin g and fillin g 223
@ Note
Do not ad d any type of radiator leak sea l­
ant to your ve hicle's engine coolant. Add ­
i ng radiator repa ir flui d may adverse ly af­
fect the funct ion and performance of your
cooling system and could result in damage not cove red by your New Vehicle l imi ted
Warranty .
Adding coolant
Be very careful when adding engine coolant.
Before you check anyth ing in the eng ine com ­
partment,
always read and heed all WARN­
INGS q & in Working in the engine compart ­
ment on page
215 .
.,. Turn off the engine.
.,. let the engi ne cool down.
.,. Place a thick rag over the coolant expansion
tank
q page 222, fig . 170 and carefully turn
the cap counter-clockwise
q &_ .
.,. Add coo la nt.
.,. Twist the cap o n aga in
tightly.
Rep lacement engine coo lant must confo rm to
exact spec ificat ions
q page 222, Coolant. We
recommend using on ly coo lant additive G 12+
+ , G 13 or in an eme rgency G12+. Do
not use a
different additive. In an emergency use pla in
water until you can get the correct additive
and can restore the correct ratio . This sho uld
be done as soon as possible.
If you have los t a cons iderab le amount o f
coolant , then you sho uld add cold antifreeze
and co ld water on ly when the engine is cold.
A lw ays use
new engine coo lant w hen refilling.
Do not f ill coo lant above t he "MAX" mark. Ex­
cess coola nt w ill be fo rced o ut through t he
pressure relief valve in the cap when the en­
gine becomes hot.
A WARNING
- The cooling system is under pressure and
can get very hot. Reduce the risk of ..,.
•
•

224 Checking and filling
scalding from hot coolant by following
these steps.
- Turn off the eng ine and a llow it to cool
down.
- Protect your face, hands and arms from escaping flu id and steam by cover ing
the cap with a large, thick rag.
- Turn the cap slowly and very carefully
i n a counter-clockwise direction while
apply ing l ight, downwa rd p ress ure on
the top of the cap .
- To avo id being burned, do not sp ill an­
tifreeze or coolant on the exhaust sys­
tem or hot engine parts . Under certain
conditions, the ethylene glyco l in en­
gine coolant can catch f ire .
- Antifreeze is poisonous . Always store an­
tifreeze in its or iginal container and we ll
out of the reach of children .
- If you drain the coolant, it must be
caught and safely stored in a proper con­
tainer clear ly marked "poison".
@ Note
- Coolant po llutes the env ironment and
could cause an engine fire . Excess coo l­
ant will be forced out through the pres­
sure relief valve in the cap when the en­
gine becomes hot.
- If, in an emergency, on ly water can be
added, the correct ratio between water
and antifreeze
c::> page 222 must be re­
stored as soon as possible .
@ For the sake of the environment
Drained coolant should not be re used. Al­
ways dispose of used coolant while observ­
ing all environmental regulat ions.
Radiator fan
The radiator fan switches on automatically by
itself
The radiator fan is driven by the engine via the
V-be lt . The viscous clutch regulates the speed
of the fan according to the temperature of the
coolant. An a
uxiliary electric radiator fan* switches on
and off depending on coolant temperature
and other vehicle operat ing condit ions .
After yo u sw itch the engine off, the aux iliary
f an can continue running for up to 10 minutes
- eve n wit h the ignition off. It can even switc h
on again later by itself
c::> &. , if
- t he tempe rature of the engine coo lant rises
due to the heat build -up from the engine in
the engine compartment, or
- the engine compa rtment heats up because
the vehicle is parked in i ntense sunlight.
_& WARNING
- To reduce the risk of personal in jury nev­
er touch the radiator fan.
- The auxiliary electric fan is temperat ure
controlled and can sw itch on suddenly
even when the engine is not running.
- The a uxiliary radiator fan sw itches on a u­
tomatically when the engine coo lant
reaches a certai n temperature and will
continue to run until the coolant temper­
ature drops.
Brake fluid
Checking brake fluid level
The brake fluid level can be checked with a
quick glance.
F ig . 17 1 Eng ine compartment: Cover on the brake flu­
i d reservo ir
Before you check a nyth ing in the engine com­
partment,
always read and h eed all WARN ­
INGS c::> .&. in Working in the engine compart-
ment on page 215. .,..

~ Read the brake fluid level from the brake
fluid reservoir ¢
fig. 171, ¢ page 217,
fig . 167.
T he brake fluid level must be be ­
tween the "MIN" and "MAX" markings.
The brake f luid reservoir is located at the rear
partition of the engine compartment on the
l eft side ¢
page 217 .
The fluid level may drop slightly after some
time due to the automatic adjustment of the brake pads . This is not cause for alarm .
If the brake fluid level falls considerably be­
l ow the "M IN" mark, the bra ke wa rning/ind i­
cator light (U .S . mode ls:
1111 , Canadian
models: .) will come on
¢ page 15. Do not
continue to operate the vehicle. The complete
brake system shou ld be thoroughly checked
by an authorized Audi dealer or qualified
workshop and the cause co rrected . If the
b rake fluid level is too low, the b rake wa rn ing/
i nd icator lig ht w ill illuminate . Co ntact an a u­
thor ized Audi dealer immediately.
@ Tips
The brake f luid rese rvoir is located unde r­
neath the cove r.
Changing brake fluid
Have the brake fluid changed by an experi­
enc ed technician .
Brake fluid ab sorbs moisture from the a ir. If
the water content in the brake fluid is too
hi gh, corrosion in the b rake system may result
after a per iod of t ime . The bo iling po int of t he
b ra ke fluid w ill also decrease con siderab ly and
d ec rease brak ing per forman ce.
Therefore, the brake flu id must be changed
every two year s. Always use new b ra ke fluid
which confo rms to Fede ral Motor Vehicle
S tand ard "FMVSS 1 16 DOT 4".
The brake flu id rese rvoir can be difficult to
r eac h, therefo re , we recommend that yo u
have the brake fl uid changed by yo ur aut ho r­
iz ed Audi dealer. Your dealer has the correc t
Checking and fillin g 225
tools, the right brake fl uid and t he know -how
to do this for you .
A WARNING
- Brake fl uid is poisonous. It must be stor­
ed only in the closed or iginal container
out of the reach of children!
- Brake failure can res ult from o ld or inap­
propriate brake f lu id. Observe these pre­
cautions:
- Use only brake fluid th at mee ts SA E
spe cificat ion
J 17 03 and conforms to
Fe dera l Mo to r Ve hicl e Standard 1 16.
Always check with yo ur autho rized Au di
dealer to make sure yo u are using the
correct brake fluid. The c orrect type of
brake f luid is also ind icated on t he
brake f luid reservoir .
- The bra ke fl uid must be new. Heavy use
of the brakes ca n cause a vapor lock if
the b rake fluid is left i n the system too
long. This can se riously affect the effi­
c iency of the b rakes as well as your
safety , T his could result in an accide nt.
(!) Note
Brake fluid will damage the pai nt of your
vehicle.
@) For the sake of the environment
Because of the prob lem of proper disposal
of brake fluid as well as the spec ial too ls
r equired an d th e nec essary exper tise, w e
r ecomme nd that yo u have th e brake flu id
c hanged by yo ur aut ho rize d Aud i dea le r.
Battery
General information
U nder normal operating cond itions, the bat­
te ry in your Audi does not need any ma inte­
nance . With
high outside temperat ures or
lo ng da ily drives we recommend that you have
t h e e lectrolyte leve l che cked by an autho riz ed
A udi de aler or qu alified workshop. The elec­
tro lyte leve l should also be checked e ach time
the battery is charged
¢ page 2 28 . 1J1>
•
•

-Always wear eye protection. Do not let
battery 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 . Sulfu­
ric 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 open­
ings.
- If you get battery acid in your eyes or
on your skin, immediately rinse with
cold water for several minutes and get
medical attention .
- 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 neg-
ative cables .
= When working on the battery, be sure
not to short-circuit the terminals with
tools or other metal objects. This would cause the battery to heat up very quickly,
which could lead to damage or explosion and personal injury.
- When a battery is charged, it produces
hydrogen 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 ca­ ble .
- Before performing any work on the elec­
trical system, switch off the engine and
ignition as well as any electrical equip ­
ment. The negative cable on the battery
must be disconnected . If you are just go­
ing to replace a light bulb, then it is
enough to switch off the lights.
- Before disconnecting the battery, switch
off the anti-theft alarm system! Other­
wise you will set off the alarm.
Checking and filling 22 7
-When disconnecting the battery, first
disconnect the negative cable and then
the positive cable.
- Before reconnecting the battery, make
sure all electrical consumers are switch­
ed off. Reconnect the positive cable first
and then the negative cable . Never inter ­
change the cables -this could start a fire!
- Never charge a frozen or a thawed-out
battery . It could explode! If a battery has
frozen , then it must be replaced . A dis­
charged battery can freeze over at 32°F
(QOC),
-Make sure the vent hose is always attach­
ed to the opening on the side of the bat­
tery .
- Never use batteries which are damaged.
There is the danger of an explosion! Al­
ways replace a damaged battery.
&_ WARNING
California Proposition 65 Warning:
- Battery posts, terminals and related ac­
cessories contain lead and lead com­
pounds, chemicals known to the State of
California to cause cancer and reproduc­
tive problems. Wash hands after han­ dling.
(D Note
- Do not disconnect the vehicle battery
when the ignition is switched on or when the engine is running, 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", oth­
erwise it will be damaged and will then
have to be replaced.
•
•

(D Note
Never use a fast charger as a booster to
start the engine . This will seriously dam­
age sensitive electronic components, such
as control units, relays, radio, etc ., as well
as the battery charger .
Battery replacement
The new battery must have the same specifi­
cations and dimensions as the original equip­
ment battery .
Intelligent energy management in your vehi­
cle is responsible for d istributing the electr i­
cal energy throughout your vehicle
c::>
page 190 . The intelligent energy manage­
ment system w ill keep the engine battery
charged bette r then vehicles w ithout t his sys­
tem. To make sure the additional electr ica l en­
ergy 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 vehicle was delivered). Specifi­
cations are listed on the bat tery hous ing. Your
author ized Audi dealer must code the battery
in the energy management system to enable
you to use the energy management functions
correctly after replac ing the battery .
If it is not possible to use a battery of this
type, the new battery must have the same ca­
pacity, voltage (12 volts) , amperage, con­
struction and plug sea ling.
When insta lling the battery, make sure the ig ­
nition and all electr ical consumers are turned
off.
(D Note
Make sure the ventilation hose on the s ide
of the battery is connected , othe rwise
fumes or battery ac id can leak out .
@ For the sake of the environment
Because of the problem of proper d isposal
of a battery, we recommend your author­
ized Aud i dealer change the battery for
Checkin g and fillin g 229
you. Batteries contain sul fur ic acid and
l ead and must always be disposed of prop­
erly in comp liance with a ll environmental
regulations. Disposing of vehicle batter ies
i mproperly is very dangerous to the envi­
ronment .
Windshield/headlight*
washer container
Fig. 173 En gin e compart men t: Cove r on the w ind­
s hi eld an d headligh t* was her fl uid conta iner
The washer fluid container is marked w ith the
symbol
Q on its cap c::> fig. 173, c::> page 217,
fig. 167 .
.,. Before you check anything in the engine
compa rtment,
always read and heed all
WARNINGS
c::> .&. in Working in the engine
compartment on page 215.
.,. Lift the f iller cap tongue to add washer flu­
id. You can fi ll the container to the top .
.. Press the cap back onto the fi ller neck after
filling the container .
You can find the reservoir
capacity in the table
in c::>
page 2 70 .
Clean water should be used when filling up. If
possib le, use soft water to prevent scaling on
the washer jets . Always add a glass cleaner
solution (with frost protection in the winter) .
(D Note
Do not mix engine coolant antifreeze or
any other additives to fill up the wind­
shield washer reservoir .
•
•

262 Emergency situations
Emergency situations
General
This chapter is intended for trained emer­
gency crews and working personnel who
have the necessary tools and equipment to perform these operations.
Starting by pushing or
towing
Q;) Note
Vehicles with an automatic transmission
cannot be started by pushing or towing.
Starting with jumper
cables
If necessary , the engine can be started by
connecting it to the battery of another vehi­
cle.
If the engine should fail to start because of a
discharged or weak battery, the battery can be
connected to the battery of
another vehicle,
using a
pair of jumper cables to start the en­
gine .
Jumper cables
Use only jumper cables of sufficiently
large cross section to carry the starter current
safely. Refer to the manufacturer's specifica­
ti ons.
Use only jumper cables with
insulated termi­
nal 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
injury. Follow the instructions below for
safe handling of your vehicle's battery.
- Always shield your eyes and avoid lean­
ing over the battery whenever possible. -
A discharged battery can freeze at tem­
peratures just below 32 °F (0 °C). Before
connecting a jumper cable, you must
thaw the frozen battery completely, oth­
erwise 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 vehicle may cause an explosion.
- Vehicle batteries generate explosive gas­
es . Keep sparks, flame and lighted ciga­
rettes 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 bat­
tery . Use of batteries of different voltage
or substantially different "Ah" rating
may cause an explosion and personal in­
jury.
- Never charge a frozen battery. Gas trap­
ped in the ice may cause an explosion.
- Never charge or use a battery that has
been frozen. The battery case may have
be weakened.
- Use of batteries of different voltage or
substantially different capacity (Ah) rat­
ing may cause an explosion and injury.
The capacity (Ah) of the booster battery
should not be lower than that of the dis­
charged battery.
- Before you check anything in the engine
compartment, always read and heed all
WARNINGS¢
page 208, Engine com­
partment.
@ Note
- Applying a higher voltage booster bat­
tery will cause expensive damage to sen­
sitive electronic components, such as
control units, relays, radio, etc.
- There must be no electrical contact be­
tween the vehicles as otherwise current
could already start to flow as soon as the
positive(+) terminals are connected. ..,.

278 Index
Automatic Shift Lock (ASL) . . . . . . . . . . . . 86
Automatic transmission . . . . . . . . . . . 83, 89
Automatic Shift Lock (ASL) . . . . . . . . . . . 86
Driving .. .. .... .. ... .... .. .. .. .. .. 84
Dynamic shift program . . . . . . . . . . . . . . 87
Emergency mode . . . . . . . . . . . . . . . . . . . 88
Emergency release . . . . . . . . . . . . . . 89, 95
Kick-down . . . . . . . . . . . . . . . . . . . . . . . . . 87
Manual shift program . . . . . . . . . . . . . . . 88
multitronic . . . . . . . . . . . . . . . . . . . . . . . . 83
Removal lock (ignition key) ..... .. .. .. 72
Selector lever . . . . . . . . . . . . . . . . . . . . . . 85
S tron ic .. .. ................ ... ... . 89
tiptronic . . . . . . . . . . . . . . . . . . . . . . . . . . 83
also refer to S tron ic transmission ..... 89
Automatic wipers . . . . . . . . . . . . . . . . . . . . 50
Auto Safety Hotline ................. 134
Average speed . . . . . . . . . . . . . . . . . . . . . . . 25
Avoid damaging the vehicle .. .. .. .... . 192
B
Battery ..... ................ .. 17,225
Battery location inside the luggage com-
partment ........ ....... .. .. .... .
226
Charging . .. ... .. ..... ... .... .. .. . 228
Important warnings when working on
the battery .... ... .... ..... .. .. .. .
226
Jump starting . ........... .. .. .. .. . 262
Low . .. .. .. ............. .. .. .. .. . 190
Replacing the battery . .. .. .. .. .. .. . 229
State of charge ............ ... .... . 190
Winter operation .......... ... .... . 225
Working on the battery ..... .... ... . 226
Before driving .. ........... .... .... . 126
Bio-ethanol (Fuel) ............ .. .. .. . 211
Blended gasoline ................... 210
Blower (automatic climate control) . . . . . . 70
Body cavity sealing ........... .. .. .. . 204
Booster seats ...... ....... .. .. .... . 173
Brake fluid
Changing the brake flu id . ........ .. .
225
Check ing the brake fluid level . .. .. ... 224
Reservoir ... ............ .. .. .. .. . 224
What is the correct brake fluid level? . . 224
What should I do if the brake fluid warn-
ing light comes on? ........ ... .. ...
224
Brake system .... .. ............. .... 224
Anti- lock braking system ............. 19
Brake assist system ................ 184
Brake fluid .... .. ......... .... .... 224
Brake fluid specifications for refill and re-
placement ...... ................ .
225
Brake light defective . . . . . . . . . . . . . . . . 21
Brake power assist unit .......... ... 187
Brakes .. .. .. .. . ............ .... .. 187
Ceramic brakes . .. ... ... ... .... .. .. 187
Electromechanical parking brake ...... 77
Warning/indicator lights .......... .. . 15
Worn brake pads symbol . . . . . . . . . . . . . 20
Braking
Emergency braking funct ion ... .. .. .. .
79
braking guard . . . . . . . . . . . . . . . . . . . . . . . 97
Messages ..... .. .. ... ........... . 105
Settings .. ... ... .. .............. . 104
Break-in period . . . . . . . . . . . . . . . . . . . . . 192
Tires . .. .. .. .. .. ............. .. .. 192
Bulbs .......... .. ............. .... 261
C
Californ ia Proposition 65 Warn ing . .... 216
Battery specific .. ... .......... .. .. 227
Capac1t1es .. ... ... .. .............. . 270
Car care ........ .. ............. .... 199
Interior . .. .. .. .. ............. .. .. 205
Plastic and vinyl .. ... ...... .... .. .. 202
Care of exterior .... ................. 199
Cargo area
refer to Luggage compartment. . . 64, 132
Catalytic converter . . . . . . . . . . . . . . . . . . 193
Center armrest . . . . . . . . . . . . . . . . . . . . . . 56
Central lock ing .. .. .......... ...... .. 32
Central lock ing switch .... ...... .. .. . 36
Convenience key . . . . . . . . . . . . . . . . . . . . 36
Remote control key ............ .... . 35
Ceramic b rake ro tors
New brake pads .. ..... ........... .
18 7
Certification . ..... ................ . 275
Changing a flat t ire . ......... .... .... 252
Changing a wheel .. ......... .... .... 252
Changing engine oil
Chassis 221
Undercoating .. .. ... .. ... ..... .. .. 204

Engine Compartment ................ .. ... 217
Coolant .. .. ................. .. .. . 222
Hood .... .. ................. .. ... 215
Starting . . . . . . . . . . . . . . . . . . . . . . 72, 75
Starting with jumper cables .. .. . ... . 262
Stopping . . . . . . . . . . . . . . . . . . . . . . 74, 76
Engine compartment Safety instructions ........ .. .. .. .. . 215
Working the engine compartment 215
Engine coolant
Indicator light . . . . . . . . . . . . . . . . . . . . . 18
Engine coolant system ...... .. .. .. .. . 222
Adding coolant ........... .... .. .. . 223
Checking coolant leve l ..... .. .. .. .. . 222
Checking the engine coolant level .. .. . 222
Radiator fan ................ ... ... 224
Engine coolant temperature
Temperatu re gauge ....... .. .. .. .. .. 10
Engine data .. ............. .... .. ... 270
Engine hood Closing . . . . . . . . . . . . . . . . . . . . . . . . . . 215
How to release the hood ... .. .. .. .. . 215
Engine oil ... .. ........... .. .. .. ... 217
Adding .. .. ............. .... .. ... 220
Additives ... ................ ... ... 220
Changing . ................. ... ... 221
Check oil level ........... .. .. .. ... 220
Consumption ............ .... .. .. . 220
Indicator light ........... .. .. .. 17,21
Oil consumption . ............. ... .. 219
Oil grades ................ ... ... .. 217
O il level symbol ............. ... ... . 21
Pressure malfunction ...... .. .. .. .. .. 17
Sensor defective . . . . . . . . . . . . . . . . . . . . 21
Specification and viscosity . . . . . . . . . . . 217
Engine speed limitation ........ .... ... 21
Environment Break-in period ........... .... .. ... 192
Catalytic converter ........ .. .. .. .. . 193
Disposing of your vehicle battery .. .. . 229
Driving at high speeds .......... .... 194
Driving to minimize pollution and noise 194
Fuel ..... .. ................. .. ... 212
Fuel economy . ........... .. .. .. ... 194
Leaks under your vehicle ... .. .. .. .. . 215
Letting the vehicle stand and warm up. 194
Proper disposal of drained brake fluid . 225
Index 281
Proper disposal of drained engine cool-
ant ....... ... .... ............... 223
Proper disposal of drained eng ine
oil . . . . . . . . . . . . . . . . . . . . . . . . . 220, 221
Recycling used engine oil ............ 220
Roof rack . . . . . . . . . . . . . . . . . . . . . . . . . 64
Unleaded fuel .. .. .. . .. .... ........ 210
What should I do with an old battery? . 229
EPC
refer to E lectronic power control . . . . . . 20
ESC (Electronic Stabilization Control)
Warning/indicator lights ............. 19
Ethyl alcohol (Fuel) . . . . . . . . . . . . . . . . . . 211
Event Data Recorder (EDR) ............ 184
Exhaust tail pipes
Cleaning ... ..... .. ............... 204
Expansion tank .. .. .. ............... 222
Exterior lighting . .. ............... .. .
44
Exterior mirrors
Adjusting ..... .... ................ 47
Dimming ... ..... .. ................ 48
Heating ....... .... ................ 47
F
Fan
Radiator 224
Fastening Booster seats .. .. .... ......... .... 173
Convertib le child safety seats .... .. .. 172
Infant seats ..... ................. 171
Flat tire
Chang ing ... .. .... ... .......... .. 252
flexible fuel . .. .. .. .. .. ........... .. 211
Floor mats ... ... .... ............... 131
Fog lights/rear fog light(s) ............. 44
Fo lding the rear seats ............... .. 64
Foot pedals . .. .. .. .. . .............. 131
For the sake of the environment Gasoline fumes and the environment .. 212
Letting the engine warm up . . . . . . 72, 75
Refueling . .. .. .. .. ............... 212
Saving fuel by early upsh ifting ..... .. . 11
Front airbags Description . . . . . . . . . . . . . . . . . . . . . . . 148
How they work ... .. ... ....... .... . 153
Frontal collisions and the laws of physics 137
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