
Cockpit77
Safety First
Operating instructions
Practical tips
Te c h n i c a l  D a t a
Main beam headlights 
This warning lamp lights up when the main beams are on.The warning lamp 
 is switched on once main beams are on or once the 
headlight flasher is operating.
Further information  ⇒page 116.
Soot accumulation in the diesel engine particulate filter 
If the indicator lights 
 you may help the filter clear itself by driving in the 
appropriate manner.
To do this, drive about 15 minutes in 4th or 5th gear (automatic gearbox: S 
gear range) at a speed of 60 km/h, with the engine running at approximately 
2000 rpm. In this way, the pollen buil d up in the filter is burned. When 
cleaning is successful, the indicator turns off.
If the indicator 
 is not deactivated, bring the vehicle to a specialised work-
shop to repair the fault.
WARNING
•
Always drive according to the road  weather conditions, the terrain and 
traffic. Driving recommendations should never lead to illegal manoeuvres 
in surrounding traffic.
•
The diesel engine particulate filter may reach extremely high tempera-
tures; it should not enter into contact with flammable materials under-
neath the vehicle. Failure to comply could result in fire.
Anti-lock brake system (ABS) 
 
A warning lamp system monitors the ABS.
The warning lamp 
 should light up for a few seconds when the ignition is 
switched on. It goes out again after th e system has run through an automatic 
test sequence.
There is a fault in the ABS if:
•
The warning lamp 
 does not light up when the ignition is switched on.
•
The warning lamp does not go out again after a few seconds.
•
The warning lamp lights up when the vehicle is moving.
The vehicle can still be braked in the normal way (except that the ABS control 
function will not function). Please take the vehicle to a qualified workshop as 
soon as possible. For further information on the ABS see the  ⇒page 183.
If a fault occurs in the ABS, the ESP* warning lamp will also light up.
Brake system fault
If the ABS warning lamp 
 lights up together with the brake warning lamp 
, this indicates not only a fault in the  ABS function, but also a possible fault 
in the brake system  ⇒.
WARNING
•
Before opening the bonnet, read and observe the warnings on 
⇒ page 213, “Working in the engine compartment”.
•
If the brake warning lamp 
 should light up together with the ABS 
warning lamp 
, stop the vehicle immediately and check the brake fluid 
level in the reservoir  ⇒page 226, “Brake fluid”. If the fluid level has 
dropped below the “MIN” mark you must not drive on. Risk of accident. 
Obtain technical assistance.
•
If the brake fluid level is correct, the fault in the brake system may have 
been caused by a failure of the ABS system. This could cause the rear 
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Cockpit
78wheels to lock quickly when you brake. This could cause the rear to break 
away. Risk of skidding. Stop the vehicle and seek technical assistance.Washer fluid 
This warning lamp lights up to indicate that the windscreen 
washer level is too low.This serves as a reminder to fill up the reservoir at the earliest opportunity 
⇒ page 222.
The following message is shown on the instrument panel display*
11):  REFILL 
WINDSCREEN WASHER FLUID .
Alternator 
 
This warning lamp signals a fault in the alternator.
The warning lamp 
 lights up when the ignition is switched on. It should go 
out when the engine has started running.
If the warning lamp  lights up while driving, the alternator is no longer 
charging the battery. You should immediately drive to the nearest qualified 
workshop.
You should avoid using electrical equipm ent that is not absolutely necessary 
because this will drain the battery.
Tyre pressure* 
The tyre pressure control system controls the tyre speed and 
the frequency spectrum of each tyre.The tyre monitor 
12) compares wheel revolutions  and with this information, 
the diameter of each wheel using the ESP sensors. If the diameter of a wheel 
changes, the tyre monitor indicator lights  . The wheel diameter changes 
when:
•
Tyre pressure is insufficient.
•
The tyre structure is damaged.
•
The vehicle is unbalanc ed because of a load.
•
The wheels of one axle are under more  pressure (for example, driving with 
a trailer or on extreme slopes).
•
The vehicle is fitted with snow chains.
•
The emergency wheel is fitted.
11)Depending on the version of the model.WARNING (continued)
12)Depending on the model version
Fig. 49  Centre console: 
tyre monitor system 
button
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Cockpit
80This warning lamp can light up together with the anti-lock brake system 
warning lamp.
WARNING
•
Before opening the bonnet, read and observe the warnings on 
⇒ page 213.
•
If the brake warning lamp does not  go out, or if it lights up when 
driving, the brake fluid level  ⇒page 226, “Brake fluid” in the reservoir is 
too low. Risk of accident. Stop the ve hicle and do not drive on. Obtain tech-
nical assistance.
•
If the brake warning lamp 
 lights up together with the ABS warning 
lamp 
, the control function of the ABS could be out of action. This could 
cause the rear wheels to lock quickly when you brake. This could cause the 
rear to break away. Risk of skidding. Stop the vehicle and seek technical 
assistance.
Engine oil pressure 
This warning lamp indicates that the engine oil pressure is 
too low.If this warning symbol starts to flash, and is accompanied by three  audible 
warnings, switch off the engine and check the oil level. If the oil level is too 
low, add more engine oil  ⇒page 216.
The instrument panel displays the following message
15): STOP ENGINE OIL 
PRESSURE INSTRUCTIONS MANUAL .
If the symbol flashes although the oil level is correct, do not  drive on. The 
engine must not even run at idle speed. Obtain technical assistance.
Cruise control system* 
The warning lamp comes on when the cruise control system 
is switched on.The warning lamp 
 lights up when the cruise control system is switched on. 
Further notes on the cruise control system  ⇒page 179.
Indicator for open doors or tailgate* 
This indicator lights if one of th e doors or the tailgate is open.The warning light 
 should go off when all the doors are closed correctly.
The system also works when the ignition is switched off. It should go off 
approx. 15 seconds after the vehicle is locked.
Power steering system* 
For vehicles with power steering, the level of steering assistance depends on 
the vehicle's speed and on the steering angle.
The warning lamp should li ght up for a few seconds when the ignition is 
switched on. It should go out once the engine is started.
If the battery is disconnected, the indicator remains lit, even with the engine 
running. The warning light only goes of f after a distance of approx. 50 m.
There is a fault in the electromechanical steering system if the lamp does not 
go out or lights up whilst the vehicle  is in motion. The indicator may appear 
in two different colours to indicate faults . If it lights yellow, this indicates a 
minor fault. If it lights red, seek workshop assistance immediately, if no 
assistance is available stop driving. Stop the vehicle and seek technical 
15)Depending on the version of the model.
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Intelligent technology189
Safety First
Operating instructions
Practical tips
Te c h n i c a l  D a t a
Caution
•
Never let the brakes “drag” by leaving your foot on the pedal when you do 
not really intend to brake. This overhe ats the brakes, resulting in longer stop-
ping distances and greater wear.
•
Before driving down a long, steep gradient, it is advisable to reduce speed 
and change to a lower gear (or move the selector lever to a lower gear position 
if your car has automatic transmission). This makes use of engine braking 
and prolongs the service life of the brakes. If you still have to use the brakes, 
it is better to brake firmly at intervals than to apply the brakes continuously.Note
•
If the brake servo is not functioning due to a malfunction, or if the vehicle 
has to be towed, you will have to press the brake pedal considerably harder 
to make up for the lack of servo assistance.
•
If you wish to equip the car with accessories such as a front spoiler or 
wheel covers, it is important that the flow of air to the front wheels is not 
obstructed, otherwise the brakes can overheat.
Power steering (servotronic*)
The power steering assists the driver when turning the 
steering wheel (with the engine running).The power steering assists the driver by reducing the force needed to turn the 
steering wheel. In cars equipped with servotronic* power steering the degree 
of power assistance is regulated  electronically according to road speed.
The power  steering will keep on working even if the  servotronic* device fails. 
The degree of power assistance will, however, no longer adapt to different 
speeds. If the electronic regulating system is not working properly, this is 
most noticeable when turning the steering wheel at low speeds (for instance  when parking) – more effort will be requ
ired than usual. The fault should be 
corrected by a qualified work shop as soon as possible.
The power steering does not work if the engine is off. In this case the steering 
wheel is very hard to turn.
If the steering is held at its  turning limit when the car is stationary, this will 
place an excessive load on the power steering system. Turning the steering 
wheel to its limit places a load on the sy stem, which causes noise. It will also 
reduce the idling speed of the engine.
Caution
When the engine is running, do not tu rn the steering wheel to its limit for 
more than 15 seconds. Otherwise, there is a risk of damaging the power 
steering.
Note
•
If the power steering should fail at any time or the engine is switched off 
(for instance when being towed), the car can still be steered. However, more 
effort will be required to turn the steering wheel.
•
If the system is leaking or malfunctioning, please take the car to a quali-
fied workshop as soon as possible.
•
The power steering requires a special hydraulic fluid. The container is 
located in the engine compartment (front  left). The correct fluid level in the 
reservoir is important for the power steering to function properly. The 
hydraulic fluid level is checked at the Inspection Service.
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Driving and the environment191
Safety First
Operating instructions
Practical tips
Te c h n i c a l  D a t a
gear if your vehicle has automatic tr
ansmission). This makes use of engine 
braking and relieves the brakes.
•
Never let the brakes “rub” by applying light pressure. Continuous 
braking will cause the brakes to overheat and the braking distance will 
increase. Apply and then release the brakes alternately.
•
Never let the vehicle run with the engine switched off. The braking 
distance is increased considerably as the brake servo does not function.
•
Very heavy use of the brakes may cause a vapour lock if the brake fluid 
is left in the system for too long. This impairs the braking effect.
•
Non-standard or damaged front spoilers  could restrict the airflow to the 
brakes and cause them to overheat. Observe the relevant instructions 
before purchasing accessories  ⇒page 208, “Technical modifications”.
•
If a brake circuit fails, the braking distance will be increased consider-
ably. Contact a qualified workshop immediately and avoid unnecessary 
journeys.
Exhaust gasses purification systemCatalytic converter*To conserve the useful life of the catalytic converter
– Always use unleaded petrol.
– Do not let the fuel get too low in the tank.
– For engine oil changes, do not top the reservoir up  ⇒page 218, 
“Topping up engine oil  ”. – Never tow the vehicle to start it, use jump leads if necessary 
⇒page 262.
If you notice misfiring, uneven running or loss of power when the vehicle is 
moving, reduce speed immediately and have the vehicle inspected at the 
nearest qualified workshop. In general, the exhaust warning lamp will light 
up when any of the described symptoms occur  ⇒page 73. If this happens, 
unburnt fuel can enter the exhaust system and escape into the environment. 
The catalytic converter can also be damaged by overheating.
WARNING
The catalytic converter reaches very high temperatures! Fire hazard!•
Never park where the catalytic converter could come into contact with 
dry grass or inflammable materials under the vehicle.
•
Do not apply additional underseal or anti-corrosion coatings to the 
exhaust pipes, catalytic converter or the heat shields on the exhaust 
system. These materials could catch fire when the vehicle is being driven.Caution
Never fully drain the fuel tank because the irregularity of the fuel supply may 
cause ignition problems. This allows unburnt fuel to enter the exhaust 
system, which could cause overheating and damage the catalytic converter.
For the sake of the environment
Even when the emission control system is working perfectly, there may be a 
smell of sulphur from the exhaust unde r some conditions. This depends on 
the sulphur content of the fuel used. Quite often the problem can be solved 
by changing to another fuel brand.
WARNING (continued)
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Checking and refilling levels
214
WARNING
All work on the engine or in the engine compartment, e.g. checking and 
refilling fluids, involves the danger of injury and scalding as well as the risk 
of accident or fire.•
Never open the bonnet if you see steam, smoke or coolant escaping 
from the engine compartment. Otherwise, there is a risk of sustaining 
burns. Wait until no more steam or  coolant is emitted, then allow the 
engine to cool before carefully opening the bonnet.
•
Switch off the engine and remove the key from the ignition.
•
Apply the handbrake and move the gea r stick to neutral or selector 
lever to position P.
•
Keep children away from the vehicle.
•
Never touch hot engine parts. There is a risk of burns.
•
Never spill liquids on a hot engine or on a hot exhaust gas system. This 
is a fire hazard.
•
Avoid causing short-circuits in the electrical system, particularly at the 
points where the jump leads are attached  ⇒page 263. The battery could 
explode.
•
Never touch the radiator fan. It is temperature controlled and could 
start automatically, even when the engine has been switched off and the 
key removed from the ignition!
•
Do not unscrew the cap on the expansion tank when the engine is hot. 
If the coolant is hot, the cooling system will be pressurised!
•
Protect face, hands and arms by covering the cap with a large, thick 
cloth to protect against escaping coolant and steam.
•
Always make sure you have not left any objects, such as cleaning cloths 
and tools, in the engine compartment.
•
If you have to work underneath the vehicle, you must use suitable 
stands additionally to support the vehicle,  there is a risk of accident!. A 
hydraulic jack is insufficient for securing the vehicle and there is a risk of 
injury.
•
If any work has to be performed when the engine is started or with the 
engine running, there is an additional, potentially fatal, safety risk from the 
rotating parts, such as the drive belt s, alternator, radiator fan, etc., and 
from the high-voltage ignition system. You should also observe the 
following points:
−Never touch the electrical wiring of the ignition system.
− Ensure that jewellery, loose clothing and long hair do not get 
trapped in rotating engine parts. Danger of death. Before starting any 
work remove jewellery, tie back and cover hair, and wear tight-fitting 
clothes.
− Always think carefully about pressing the accelerator if a gear is 
engaged in either an automatic or manual gearbox. The vehicle could 
move, even if the handbrake is applied. Danger of death.
•
If work has to be carried out on the fuel system or on electrical compo-
nents, you must observe the following safety notes in addition to the above 
warnings:
−Always disconnect the battery. The vehicle must be unlocked when 
this is done, otherwise the alarm will be triggered.
− Do not smoke.
− Never work near naked flames.
− Always have a fire extinguisher on hand.Caution
When changing or topping up service fluids, make absolutely certain that you 
fill the fluids into the correct reservoirs. Failure to observe this point will result 
in serious malfunctions and engine damage!
WARNING (continued)
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Checking and refilling levels221
Safety First
Operating instructions
Practical tips
Te c h n i c a l  D a t a
Checking the coolant level and topping up 
The correct coolant level is important for fault-free func-
tioning of the engine cooling system.Before opening the bonnet, read and observe the warnings  ⇒ in 
“Safety instructions on working in the engine compartment” on 
page 213.
Opening the coolant expansion tank
– Switch off the engine and allow it to cool.
– To prevent scalding, cover the cap on the expansion tank with a  thick cloth and carefully unscrew the cap  ⇒.
Checking coolant level
– Look into the open coolant expansion tank and read off the  coolant level. – If the level is underneath the 
“MIN” mark, top up with coolant.
Topping up coolant
–Only use new coolant.
– Do not fill above the “MAX” mark.
Closing the coolant expansion tank
–Screw the cap on again  tightly.
The position of the coolant expansion reservoir is shown in the corresponding 
engine compartment diagram  ⇒page 273.
Make sure that the coolant meets the required specifications ⇒ page 220. 
Do not use a different type of additive if coolant additive G 12+ is not avail-
able. In this case use only water and  bring the coolant concentration back up 
to the correct level as soon as possible by putting in the specified additive 
⇒ page 220.
Always top up with new coolant.
Do not fill above the “MAX” mark. Otherwise the excess coolant will be forced 
out of the cooling system when the engine is hot.
The coolant additive G 12+ (dyed purple) may be mixed with G 12 (dyed red) 
and also with G 11.
WARNING
Any work carried out in the engine compartment or on the engine must be 
carried out cautiously.•
When working in the engine compartm ent, always observe the safety 
warnings  ⇒page 213.
Fig. 161  In the engine 
compartment: Coolant 
expansion tank cap
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Checking and refilling levels
222•
When the engine is warm or hot, th e cooling system is pressurised! Do 
not unscrew the cap on the expansion t ank when the engine is hot. This is 
a burn injury risk.Caution
•
When mixed with other additives the colour of G 12 will change to brown. 
If this occurs you should have the coolant changed immediately. Failure to do 
so will result in engine damage!
•
If a lot of coolant has been lost, wait for the engine to  cool down before 
putting in cold coolant. This avoids damaging the engine. Large coolant 
losses are an indication of leaks in the cooling system. See a specialised 
workshop immediately and have the cooling system checked. Otherwise, 
there is a risk of engine damage.
Washer fluid and windscreen wiper bladesTopping up washer fluid 
The water for cleaning the windscreen should always be 
mixed with washer fluid.The  windscreen washer  and the headlight washing system  are supplied with 
fluid from the windscreen washer flui d container in the engine compartment.
The reservoir is located on  the right-hand side of the engine compartment.
Plain water is not enough to clean the windscreen and headlights. We recom-
mend that you always add a product to the windscreen washer fluid. 
Approved windscreen cleaning products exist on the market with high deter-
gent and anti-freeze properties, these may be added all-year-round. Please 
follow the dilution instructions on the packaging.
WARNING (continued)
Fig. 162  In the engine 
compartment: Cap of 
windscreen washer fluid 
reservoir.
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