Get Wheels and tyres -> Tyre pressure Guide for Mercedes A Class 4 Door Third Generation (2012-2017)

Tyre pressure

362

Tyre pressure

If you are unable to rectify the damage, con-

tact a qualified specialist workshop.

Tyre pressure specifications

Environmental note

WARNING

Underinflated or overinflated tyres pose the

following risks:

Check the tyre pressure regularly, at least

every 14 days.

the tyres may burst, especially as the load

and vehicle speed increase.

the tyres may wear excessively and/or

unevenly, which may greatly impair tyre

traction.

The recommended tyre pressures for various

operating conditions can be found in the tyre

pressure table on the fuel filler flap

(Y page 181).

Operation with an emergency spare

wheel: information on operation with an

emergency spare wheel can be found in the

generalnotes in the "Emergency spare wheel"

section (Y page 390).

Operation with a trailer: the applicable

value for the rear axle is the maximum tyre

pressure value stated in the table inside the

fuel filler flap.

Additionally, the tyre pressure table may also

state tyre pressures for different load condi-

tions. These are defined in the table as dif-

ferent numbers of passengers and amounts

of luggage. The actual number of seats may

vary; for more information, please refer to the

vehicle's registration documents.

the driving characteristics, as well as steer-

ing and braking, may be greatly impaired.

There is a risk of an accident.

Observe the recommended tyre pressure and

check the tyre pressure of all the tyres includ-

ing the spare wheel:

at least every two weeks

when the load changes

before embarking on a longer journey

for changed operating conditions, e.g. off-

road driving

If necessary, correct the tyre pressure.

WARNING

If you fit unsuitable accessories onto tyre

valves, the tyre valves may be overloaded and

malfunction, which can cause tyre pressure

loss. Due to their design, retrofitted tyre pres-

sure monitors keep the tyre valve open. This

can also result in tyre pressure loss. There is a

risk of accident.

If tyre sizes are not specified, the tyre pres-

sures stated on the tyre pressure table apply

for all tyres approved for this vehicle.

Only screw standard valve caps or valve caps

specifically provided by Mercedes-Benz for

your vehicle onto the tyre valve.

WARNING

If the tyre pressure drops repeatedly, the

wheel, valve or tyre may be damaged. Tyre

pressure that is too low may result in a tyre

blow-out. There is a risk of accident.

If a tyre size precedes a tyre pressure, the

following tyre pressure information is only

valid for that tyre size.

Check the tyre for foreign objects.

Use a suitable pressure gauge to check the

tyre pressure. The outer appearance of a tyre

Check whether the wheel is losing air or the

valve is leaking.

Tyre pressure

363

does not permit any reliable conclusion about of rotation of a wheel changes as a result of a

the tyre pressure. On vehicles fitted with the loss of pressure, a corresponding warning

electronic tyre pressure monitor, the tyre

pressure can be checked using the on-board play.

computer.

If possible, only correct tyre pressures when warning by the Run Flat Indicator

message will appear in the multifunction dis-

You can recognise the tyre pressure loss

the tyres are cold.

The tyres are cold:

active Restart with OK message which

appears in the multifunction display in the

Serv.menu. Information on the message dis-

play can be found in the "Restarting the tyre

pressure loss warning system" section

(Y page 364).

if thevehiclehas been parkedwiththetyres

out of direct sunlight for at least three

hours and

if the vehicle has not been driven further

than 1.6 km

Important safety notes

Depending on the ambient temperature, the

vehicle speed and the load on the tyres, the

tyre temperature and thus the tyre pressure

changes by approximately 10 kPa (0.1 bar/

1.5 psi) per 10 †. Take this into account

when checking the pressure of warm tyres.

Only correct the tyre pressure if it is too low

for the current operating conditions.

The tyre pressure warning system does not

warn you of an incorrectly set tyre pressure.

Observe the notes on the recommended tyre

pressure (Y page 362).

The tyre pressure loss warning does not

replace the need to regularly check the tyre

pressures. An even loss of pressure on sev-

eral tyres at the same time cannot be detec-

ted by the tyre pressure loss warning system.

Driving with tyre pressure that is too high or

too low can:

The tyre pressure monitor is not able to warn

you of a sudden loss of pressure, e.g. if the

tyre is penetrated by a foreign object. In the

event of a sudden loss of pressure, bring the

vehicle to a halt by braking carefully. Avoid

abrupt steering manoeuvres.

shorten the service life of the tyres

cause increased tyre damage

have a negative effect on handling charac-

teristics and thus driving safety (e.g. aqua-

planing)

The tyre pressure values given for low loads

are minimum values which offer you good ride

comfort characteristics.

However, you can also use the values given

for higher loads. These are permissible and

will not adversely affect the running of the

vehicle.

The function of the tyre pressure loss warning

system is limited or delayed if:

snow chains are fitted to your vehicle's

tyres.

road conditions are wintry.

you are driving on sand or gravel.

you adopt a very sporty driving style (cor-

nering at high speeds or driving with high

rates of acceleration).

you are towing a very heavy or large trailer.

Tyre pressure loss warning system

General notes

you are driving with a heavy load (in the

While the vehicle is in motion, the tyre pres-

sure loss warning system monitors the set

tyre pressure using the rotational speed of

the wheels. This enables the system to detect

significant pressure loss in a tyre. If the speed

vehicle or on the roof).

Tyre pressure

364

Restarting the tyre pressure loss warn- If you wish to cancel the restart:

ing system

Press the % button.

Restart the tyre pressure loss warning system

if you have:

If the Tyre presss. now OK? message

appears, press the 9 or : button to

select Cancel.

Press the a button.

The tyre pressure values stored at the last

restart will continue to be monitored.

changed the tyre pressure

changed the wheels or tyres

fitted new wheels or tyres

Before restarting, make sure that the tyre

pressures are set properly on all four tyres

for the respective operating conditions.

The recommended tyre pressures can be

found in the tyre pressure table on the fuel

filler flap.

Tyre pressure monitor

General notes

The tyre pressure loss warning system can

only give reliable warnings if you have set

the correct tyre pressure. If an incorrect

tyre pressure is set, these incorrect values

will be monitored.

Observe the notes in the section on tyre

pressures (Y page 362).

Make sure that the key is in position 2 in the

ignition lock (Y page 157).

Press = or ; on the steering wheel

to select the Serv.menu.

If a tyre pressure monitor system is fitted, the

vehicle's wheels have sensors fitted that

monitor the tyre pressures in all four tyres.

The tyre pressure monitor warns you if the

pressure drops in one or more of the tyres.

The tyre pressure monitor only functions if

the corresponding sensors are fitted to all

wheels.

Information on tyre pressures is shown in the

multifunction display. After a few minutes of

driving, the current tyre pressure of each tyre

is shown in the Serv. menu of the multifunc-

tion display, see illustration (example).

Press the 9 or : button to select

Tyre pressure.

Press the a button.

The Run Flat Indicator active

Restart with OK message appears in the

multifunction display.

If you wish to confirm the restart:

Press the a button.

The Tyre press. now OK? message

appears in the multifunction display.

Press the 9 or : button to select

Yes.

For further information on displaying this

message, refer to the "Checking the tyre pres-

sure electronically" section (Y page 365).

Press the a button.

Important safety notes

The Run Flat Indicator restarted

message appears in the multifunction dis-

play.

After a teach-in period, the tyre pressure

loss warning system will monitor the set

tyre pressures of all four tyres.

It is the driver's responsibility to set the tyre

pressure to the recommended cold tyre pres-

sure suitable for the operating situation

(Y page 362). Note that the correct tyre pres-

sure for the current operating situation must

first be taught-in to the tyre pressure monitor.

Tyre pressure

365

If there is a substantial loss of pressure, the ured at a filling station using a pressure

warning threshold for the warning message is gauge. The tyre pressures shown by the on-

aligned to the reference values taught-in.

Restart the tyre pressure monitor after

adjusting to the cold tyre pressure

(Y page 366). The current pressures are

saved as new reference values. This will

ensure that a warning message will only

appear if the tyre pressure drops significantly.

board computer refer to those measured at

sea level. At high altitudes, the tyre pressure

values indicated by a pressure gauge are

higher than those shown by the on-board

computer. In this case, do not reduce the tyre

pressures.

The operation of the tyre pressure monitor

The tyre pressure monitor does not warn you can be affected by interference from radio

of an incorrectly set tyre pressure. Observe transmitting equipment (e.g. radio head-

the notes on the recommended tyre pressure phones, two-way radios) that may be being

(Y page 362).

operated in or near the vehicle.

The tyre pressure monitor is not able to warn

you of a sudden loss of pressure, e.g. if the

tyre is penetrated by a foreign object. In the

event of a sudden loss of pressure, bring the

vehicle to a halt by braking carefully. Avoid

abrupt steering manoeuvres.

The tyre pressure monitor has a yellow warn-

ing lamp in the instrument cluster for indicat-

ing a pressure loss or malfunction. Depending

on how the warning lamp flashes or lights up,

a tyre pressure that is too low or a malfunc-

tion in the tyre pressure monitor is indicated:

Checking the tyre pressure electroni-

cally

Make sure that the key is in position 2 in the

ignition lock (Y page 157).

Press = or ; on the steering wheel

to select the Serv.menu.

Press the 9 or : button to select

Tyre pressure.

Press the a button.

The current tyre pressure for each wheel

will be displayed in the multifunction dis-

play.

if the warning lamp is lit continuously, the

tyre pressure on one or more tyres is sig-

nificantly too low. The tyre pressure moni-

tor is not malfunctioning.

If the vehicle was parked for longer than

20 minutes, the Tyre pressures wwill be

displayed after a few minutes ooff

driving message is shown.

After a teach-in period, the tyre pressure

monitor automatically detects new wheels or

new sensors. As long as a clear allocation of

the tyre pressure values to the individual

wheels is not possible, the Tyre preessure

monittor active message is shown instead

of the tyre pressure display. The tyre pres-

sures are already being monitored.

If an emergency spare wheel is fitted, for a

few minutes the system may continue to

show the tyre pressure of the wheel that has

been removed. If this occurs, note that the

value displayed for the position where the

spare wheel is fitted is not the same as the

current tyre pressure of the emergency spare

wheel.

if the warning lamp flashes for around a

minute and then remains lit constantly, the

tyre pressure monitor is malfunctioning.

In addition to the warning lamp, a message

appears in the multifunction display. Observe

the information on display messages

(Y page 283).

It may take up to ten minutes for a malfunc-

tion of the tyre pressure monitor to be indi-

cated. A malfunction will be indicated by the

tyre pressure warning lamp flashing for

approximately one minute and then remain-

ing lit. When the fault has been rectified, the

tyre pressure warning lamp goes out after you

have driven for a few minutes.

The tyre pressure values indicated by the on-

board computer may differ from those meas-

Tyre pressure

366

Warning messages of the tyre pressure

monitor

Use the table on the inside of the fuel filler

flap to ensure that the tyre pressure is set

correctly in all four tyres for the current

operating conditions.

Also observe the notes in the section on

tyre pressures (Y page 362).

Make sure that the key is in position 2 in the

ignition lock (Y page 157).

Press = or ; on the steering wheel

to select the Serv.menu.

Press the 9 or : button to select

Tyre preessure.

Press the a button.

If the tyre pressure monitor detects a pres-

sure loss in one or more tyres, a warning mes-

sage is shown in the multifunction display.

The yellow tyre pressure warning lamp then

lights up.

If the Please corrrect tyre pressure

message appears in the multifunction dis-

play, the tyre pressure in at least one tyre is

too low. The tyre pressure must be correc-

ted when the opportunity arises.

If the Tyre presssure Check tyre(s)

The multifunction display shows the cur-

rent tyre pressure for each tyre or the

Tyre presssures wwiill be dissplayed

afterr a few minutes of driving mes-

sage.

message appears in the multifunction dis-

play, the tyre pressure in one or more tyres

has dropped significantly. The tyres must

be checked.

If the Tyre pressure Caution Tyre

Press the : button.

malfunnction message appears in the mul-

tifunction display, the tyre pressure in one

or more tyres has dropped suddenly. The

tyres must be checked.

The multifunction display shows the Use

current prressurres as new refference

valuees message.

Observe the instructions and safety notes in

the display messages in the "Tyres" section

(Y page 283).

If the wheel positions on the vehicle are inter-

changed, the tyre pressures may be displayed

for the wrong positions for a short time. After

a few minutes of driving, this is rectified and

the tyre pressures are displayed for the cor-

rect positions.

If you wish to confirm the restart:

Press the a button.

The Tyre prress. mmonitoor restarted

message appears in the multifunction dis-

play.

After you have driven for a few minutes, the

system checks whether the current tyre

pressures are within the specified range.

The new tyre pressures are then accepted

as reference values and monitored.

Restarting the tyre pressure monitor

If you wish to cancel the restart:

When you restart the tyre pressure monitor,

all existing warning messages are deleted and

the warning lamps go out. The monitor uses

the currently set tyre pressures as the refer-

ence values for monitoring. In most cases, the

tyre pressure monitor will automatically

detect the new reference values after you

have changed the tyre pressure. However,

you can also set reference values manually as

described here. The tyre pressure monitor

then monitors the new tyre pressure values.

Press the % button.

The tyre pressure values stored at the last

restart will continue to be monitored.

Wheels and tyres -> Tyre pressure for Your Mercedes A Class 4 Door Third Generation (2012-2017)

Related Topics

Popular Owner Manuals

Latest Owner Manuals