In vehicles not equipped with the START-STOP system, turn off the engine when
in a traffic jam, at a level crossing or traffic lights with longer wait times.
Even after just 30 – 40 seconds you will have saved more fuel than that is needed
when you start the engine up again.
If an engine is only idling it takes much longer for it to reach its normal operating
temperature. Wear-and-tear and pollutant emissions, though, are particularly
high in the warming-up phase. Therefore, start driving as soon as the engine has
started, though high engine speeds should be avoided.
Avoiding short distances
Fig. 98
Principle sketch: Fuel consump-
tion in l/100 km at different tem-
peratures
First read and observe the introductory information and safety warn-
ings on page 105.
Short distances result in an above-average high fuel consumption. We therefore
recommend avoiding distances of less than 4 km if the engine is cold.
A cold engine consumes the most fuel immediately after the start. Fuel consump-tion drops to 10 litres/100 km after just 1 kilometre. The consumption stabilises
once the engine and catalytic converter have reached their operating tempera- ture.
An important factor in this connection is also the ambient temperature. The im-
age » Fig. 98 shows the different levels of fuel consumption after driving a cer-
tain distance at a temperature of +20 °C and at a temperature of -10 °C.
The vehicle has a higher fuel consumption in winter than in summer.
Checking tyre inflation pressure
First read and observe the introductory information and safety warn-ings
on page 105.
Tyres which are correctly inflated save fuel.
Always ensure the tyre inflation pressure is correct. If the inflation pressure is too
low, the tyres will have to overcome a higher rolling resistance. This will not only increase fuel consumption but also tyre wear and the driving behaviour will wor-
sen.
Always check the tyre inflation pressure when the tyres are cold.
Avoiding unnecessary ballast
First read and observe the introductory information and safety warn-
ings
on page 105.
Transporting ballast costs fuel.
Each kilogramme of weight increases the fuel consumption. Therefore, we rec-
ommend to carry no unnecessary weight.
It is particularly in town traffic, when one is accelerating quite often, that the ve-
hicle weight will have a significant effect upon the fuel consumption. A rule of
thumb here is that an increase in weight of 100 kilograms will cause an increase in fuel consumption of about 1 litre/100 kilometres.
At a speed of 100 - 120 km/h, your vehicle that is fitted with a roof rack crossmember without a load will use use about 10 % more fuel than normal due to the
increased aerodynamic drag.
Regular maintenance
First read and observe the introductory information and safety warn-
ings
on page 105.
A poorly tuned engine uses an unnecessarily high amount of fuel.
By having your vehicle regularly maintained by a specialist garage, you create the conditions needed for economical driving. The maintenance state of your vehicle has a positive effect on traffic safety and value retention
107Starting-off and Driving
NoteYou can find more detailed information about the trade-in and recycling of old
cars from a specialist garage.
Avoiding damage to your vehicle
Introduction
This chapter contains information on the following subjects:
General information
109
Driving through water on streets
109
General information
First read and observe the introductory information given on page 109.
Pay attention to low-slung parts of the vehicle, such as the spoiler and exhaust,particularly in the following situations.
› When driving on poorly maintained roads and paths.
› When driving over kerbs.
› When driving on steep ramps etc.
Particular attention must be paid for vehicles with sport suspension and when the vehicle is fully laden.
Driving through water on streets
Fig. 99
Driving through waterFirst read and observe the introductory information given on page 109.
The following instructions must be observed if vehicle damage is to be avoided
when driving through water (e.g. flooded roads).
›
Determine the depth of the water before driving through.
The water level must not reach above the bar on the lower beam » Fig. 99.
›
Do not drive any faster than at a walking speed.
At a higher speed, a water wave can form in front of the vehicle, which can cause
water to penetrate into the engine's air induction system or other parts of the ve-
hicle.
›
Never stop in the water, do not reverse and do not switch the engine off.
›
Deactivate the START-STOP system before driving through water » page 116,
START-STOP .
WARNING■
Driving through water, mud, sludge etc. can impair the braking power and
increase the braking distance – risk of accident!■
Avoid abrupt and sudden braking immediately after water crossings.
■
After driving through bodies of water, the brakes must be cleaned and dried
as soon as possible by intermittent braking. Only apply the brakes for the pur-
pose of drying and cleaning the brake discs if the traffic conditions permit this.
Do not place any other road users in jeopardy.
CAUTION
■ When driving through water, some parts of the vehicle such as the engine,
gearbox, chassis or electrics can be severely damaged.■
Oncoming vehicles can generate water waves which can exceed the permissible
water level for your vehicle.
■
Potholes, mud or rocks can be hidden under the water making it difficult or im-
possible to drive through the body of water.
■
Do not drive through salt water. The salt can lead to corrosion. Any vehicle parts
that have come into contact with salt water must be rinsed immediately with
fresh water.
109Starting-off and Driving
START-STOP
Introduction
This chapter contains information on the following subjects:
Starting/shutting down the engine
116
Operating conditions of the system
117
Manually activating/deactivating the system
117
Information messages
118
The START-STOP system helps you to save fuel while at the same time reducing
harmful exhaust emissions and CO 2 emissions.
The function is automatically activated each time the ignition is switched on.
In the start-stop mode, the engine automatically switches to the vehicle's idle phase, e.g. when stopped at traffic lights. The engine restarts automatically
where necessary.
The system can work only if the following basic conditions are met. The driver's door is closed.
The driver has fastened the seat belt. The bonnet is closed.The driving speed was higher than 4 km/h after the last stop.
No trailer is coupled.
WARNING■ The brake servo unit and power steering only operate if the engine is run-
ning.■
Never let the vehicle roll with the engine switched off.
CAUTION
Always deactivate the START-STOP system before driving through wa-
ter » page 109 .Note■
If the driver's seat belt is removed for more than approx. 30 seconds or the driv-
er's door is opened during stop mode on vehicles with manual transmission or au- tomatic transmission (when the selector lever in position P), the engine must be
started manually.■
After manually starting the engine on vehicles with manual transmission, auto-
matic engine shut down is not possible until the vehicle has travelled the re-
quired minimum distance for START-STOP mode.
■
If, on vehicles with automatic transmission, the selector lever positions D, S or N
are selected after driving in reverse, the vehicle will first need to achieve a speed
of over 10 km/h before automatic engine shut down can take place again.
■
Changes to the outdoor temperature can have an effect on the internal temper-
ature of the vehicle battery even after several hours. If the vehicle remains out-
doors for a long time in minus temperatures or in direct sunlight, it can take sev-
eral hours until the internal temperature of the vehicle battery reaches a suitable temperature for proper operation of the START STOP system.
■
If Climatronic is running in automatic mode, the engine may not switch off auto-
matically under certain conditions.
Starting/shutting down the engine
First read and observe the introductory information and safety warn-ings
on page 116.
Vehicles with manual transmission
›
Stop the vehicle (where necessary, apply the handbrake).
›
Put the gear stick into Neutral.
›
Release the clutch pedal.
Automatic engine shut down (STOP phase) takes place. The warning symbol
appears in the instrument cluster display.
›
Depress the clutch pedal.
The automatic start procedure takes place again (START phase). The warning
symbol
goes out.
Vehicles with automatic transmission
›
Bring the vehicle to a stop and depress the brake pedal.
Automatic engine shut down takes place. The warning symbol
appears in the
instrument cluster display.
›
Release the brake pedal.
116Driving
The automatic start procedure takes place again. The warning symbol goes
out.
Further information on automatic transmission Engine shut down takes place when the selector lever is in positions P, D , S and N
and in Tiptronic mode.
When the selector lever is in position P, the engine remains shut down even after
you release the brake pedal. Start the engine by pressing the gas pedal or by moving the selector lever into a different mode and releasing the brake pedal.
If the selector lever is moved into position R during the STOP phase , the engine
will re-start.
No automatic engine shutdown takes place when the vehicle is moving at low speed (e.g. during a traffic jam or when tuning) and remains stationary after
pressing the brake pedal lightly. Automatic engine shutdown takes place if you
press the brake pedal down with more force.
Operating conditions of the system
First read and observe the introductory information and safety warn-ings
on page 116.
The START-STOP system is very complex. Some of the procedures are hard to check without servicing.
No engine shut down is carried out
Before each STOP phase, the system checks whether certain conditions have
been met. No engine shut down takes place in the following situations.
› The engine has not reached the minimum temperature for the START STOP
mode.
› The temperature inside the vehicle has not reached the desired temperature
set in the air-conditioning system/heating.
› The external temperature is very low/high.
› The intensive windscreen heater (Climatronic) or windscreen heater/ventilation
is switched on with the maximum air temperature setting (manual air condition-
ing system).
› The parking aid is activated.
› The charge state of the vehicle battery is too low.
› The stationary vehicle is on a steep slope or a steep downhill section.
› The idling speed is too high.
› The steering angle is too large (manoeuvring).
› The selector lever position
R is selected (e.g. when parking).
The warning symbol appears in the instrument cluster display.
The automatic start procedure takes place again
During the STOP phase, the engine fires up without any active driver intervention, e.g. in the following situations.
› The vehicle begins to roll, e.g. on a slope.
› The difference between the temperature setting of the air-conditioning sys-
tem/heating and the temperature of the interior is too large.
› The intensive windscreen heater (Climatronic) or windscreen heater/ventilation
is switched on with the maximum air temperature setting (manual air condition-
ing system).
› The brake pedal was pressed several times (the pressure in the braking system
is too low).
› The charge state of the vehicle battery is too low.
› The current consumption is too high.
Manually activating/deactivating the system
Fig. 103
Button for the START-STOP sys-
tem
First read and observe the introductory information and safety warn-
ings on page 116.
Activation/deactivation
›
Press the symbol button
» Fig. 103 .
When start-stop mode is deactivated, the warning light in the button lights up.
Note
If the system is deactivated during the STOP phase, the automatic start proce-
dure takes place.
117Assist systems
Information messagesFirst read and observe the introductory information and safety warn-
ings
on page 116.
The messages and information are indicated in the instrument cluster display.
Start the engine manually!
START MANUALLY
The driver sees this message when the conditions for the automatic start proce-
dure are not met during the STOP phase. The engine must be started manually.
Error: start-stop system
ERROR START-STOP
Error in the START-STOP system. Seek help from a specialist garage.
118Driving
Driving with a trailerFig. 112
Swivel out the 13-pin power
socket
First read and observe the introductory information and safety warn-
ings on page 123.
Before the journey
›
Grip the 13-pin socket on the handle
A
and swing out in the direction of the
arrow » Fig. 112 .
›
Lift off protective cap
5
» Fig. 104 on page 119.
After the journey
›
Grip the 13-pin socket on the handle
A
and swing in the opposite direction to
the arrow » Fig. 112.
›
Place the protective cover
5
» Fig. 104 on page 119 onto the tow bar.
Safety eyelet
The purpose of the safety eyelet
B
» Fig. 112 is to attach the breakaway cable of
the trailer.
When attaching the breakaway cable to the safety eyelet, it must sag freely
against the vehicle in all trailer positions (sharp bends, in reverse etc.).
Exterior mirrors
You have to have additional exterior mirrors fitted if you are not able to see the
traffic behind the trailer with the standard rear-view mirrors. The national legal requirements must be observed.
Headlights
The front of the vehicle may lift up when a trailer is being towed and the head-
lights may dazzle other road users.
Adjust the headlights using the headlight beam control » page 41.
Driving speed
For safety reasons, do not drive faster than 80 km/h when towing a trailer.
Immediately reduce your speed as soon as even the slightest swaying of the trail-
er is detected. Never attempt to stop the trailer from “swaying” by accelerating.
Brakes
Apply the brakes in good time! If the trailer is fitted with a trailer brake, apply the
brakes gently at first, then brake firmly. This will avoid brake jolts resulting from
the trailer wheels locking.
On downhill sections shift down a gear in good time to also use the engine as a brake.
Engine overheating
If the needle for the coolant temperature gauge moves into the right-hand area
or the red area of the scale, the speed must be reduced immediately.
Stop and switch off the engine if the indicator light
in the instrument cluster
starts to flash » page 16. Wait a few minutes and check the level of cool-
ant » page 169 .
The following guidelines must be observed » page 16.
The coolant temperature can be reduced by switching on the heating.WARNING■ Never use the safety eyelet for towing!■Adapt your speed to the conditions of the road surface and to the traffic sit-
uation.■
Improper or incorrectly connected electric cables can energise the trailer and
cause functional faults to the vehicle's entire electrical system as well as acci-
dents and severe injuries.
■
Work on the electrical system must only be carried out by specialist garages.
■
Never directly connect the trailer's electrical system with the electrical con-
nections for the tail lights or other current sources.
Note
■ After coupling the trailer and connecting the power socket, check that the rear
lights on the trailer are working correctly.■
If there is an error in the trailer lighting, check the fuses in the fuse box in the
dash panel » page 197.
124Driving
Checking the battery electrolyte levelFig. 140
Vehicle battery: Electrolyte level
indicator
First read and observe the introductory information and safety warn-
ings on page 171.
On vehicles with a vehicle battery fitted with a colour indicator, the so-called
magic eye » Fig. 140, the electrolyte level can be determined by looking at the
change in colour.
Air bubbles can influence the colour of the indicator. For this reason carefully
knock on the indicator before carrying out the check.
› Black colour – electrolyte level is correct.
› Colourless or light yellow colour – electrolyte level too low, the battery must be
replaced.
Vehicles with a START-STOP system are fitted with a battery control unit for checking the energy level for the recurring engine start.
We recommend that you have the acid level checked regularly by a specialist ga-
rage, especially in the following cases.
› High external temperatures.
› Longer day trips.
› After each charge.
Winter time
The vehicle battery only has a proportion of the starting power in lower tempera-
tures. A discharged vehicle battery may already freeze at temperatures just be-
low 0 °C .
We therefore recommend that you have the battery checked and, if necessary, re-
charged by a specialist garage before the start of the winter.
CAUTIONFor technical reasons, on vehicles with the description “AGM”, the electrolyte lev- el cannot be checked.
Note
The battery acid level is also checked regularly by a specialist garage as part of
the inspection service.
Charging
First read and observe the introductory information and safety warn-ings
on page 171.
A properly charged vehicle battery is essential for reliably starting the engine.
›
Switch off the ignition and all of the electrical components.
›
Only when performing a “quick-charge”, disconnect both battery cables (first
“negative”, then “positive”).
›
Attach the terminal clamps of the charger to the battery terminals (red = “posi- tive”, black = “negative”).
›
Plug the mains cable of the charger into the power socket and switch on the
device.
›
After charging has been successful: Switch off the charger and remove themains cable from the power socket.
›
Only then disconnect the charger's terminal clamps.
›
Reconnect the cables to the battery (first “positive”, then “negative”).
It is not necessary to disconnect the cables of the battery if you recharge the ve-
hicle battery using low amperages (for example from a mini-charger). Refer to the
instructions of the charger manufacturer .
A charging current of 0.1 multiple of the total vehicle battery capacity (or lower) must be used until full charging is achieved.
It is necessary to disconnect both cables before charging the battery with high
amperages, known as “ rapid charging”.
The vent plugs of the vehicle battery should not be opened for charging.
173Inspecting and replenishing
WARNING“Quick-charging” the vehicle battery is dangerous and requires a special
charger and specialist knowledge.
CAUTION
On vehicles with the START/STOP system, the pole terminal of the charger must
not be connected directly to the negative terminal of the vehicle battery, but only
to the engine earth » page 191, Jump-starting in vehicles with the START-STOP
system .
Note
We therefore recommend that vehicle batteries be rapid charged by a specialist
garage.
Replacing
First read and observe the introductory information and safety warn-
ings
on page 171.
When replacing a battery, the new vehicle battery must have the same capacity,
voltage, amperage and be the same size. Suitable vehicle battery types can be
purchased from a specialist garage.
We recommend having the battery replaced by a specialist garage, where the
new vehicle battery will be installed properly and the original battery will be dis-
posed of in accordance with national regulations.
Disconnecting and reconnecting
First read and observe the introductory information and safety warn-
ings
on page 171.
On disconnecting and reconnecting the vehicle battery, the following functions
are initially deactivated or are no longer able to operate fault-free:
OperationOperating measureEnter the radio/navigation system code num-
ber» User manual of the radio
or » user manual of the naviga-
tion systemSetting the clock» page 13Data in the multifunction display are deleted.» page 25
Note
We recommend having the vehicle checked by a specialist garage in order to en-
sure full functionality of all electrical systems.
Automatic load deactivation
First read and observe the introductory information and safety warn-ings
on page 171.
The vehicle voltage control unit automatically prevents the battery from discharg-
ing when the battery is put under high levels of strain. This manifests itself by the
following.
› The idling speed is raised to allow the generator to deliver more electricity to
the electrical system.
› Where necessary, large convenience consumers such as seat heaters and rear
window heaters have their power limited or are shut off completely in the event
of an emergency.
CAUTION
■ Despite such intervention by the vehicle electric system management, the vehi-
cle battery may be drained. For example, when the ignition is switched on a long
time with the engine turned off or the side or parking lights are turned on during longer parking.■
Consumers that are supplied via a 12-V power socket can cause the vehicle bat-
tery to discharge when the ignition is switched off.
Note
Driving comfort is not impaired by consumers being deactivated. The driver is of-
ten not aware of it having taken place.
174General Maintenance