251Wheels and tyres
Significant tyre pressure loss
The tyre symbol is displayed and indicates that the tyre pressure
of at least one tyre is insufficient.
–Stop the vehicle.
–Switch the engine off.
–Check the tyre(s).
–Change the wheel if necessary.
Tyre pressure monitoring (RKA+)*
The tyre pressure monitor display on the instrument panel
indicates if the pressure is too low.
Fig. 189 Detailed view of
the centre console: But-
ton for the tyre pressure
monitoring system
The tyre pressure monitoring system makes use of the ABS sensors to com-
pare the rolling circumference and the frequency characteristics of the
wheels. If the rolling circumference or frequency characteristic changes on
one or more wheels, the tyre pressure warning lamp will light up. The
fault will also be indicated by a warning buzzer. The position of the affected
tyre will also be shown (if only one tyre is affected) on the centre display of
the instrument panel.
The rolling circumference and frequency characteristics can change if:
●the tyre pressure is too low.
●the tyre has suffered structural damage.
●the wheels or the inflation pressures have been changed without initial-
ising the system (see Adjusting the tyre pressure settings).
●there is a greater load on the wheels of one axle (e.g. if you are carrying
more passengers or luggage).
●the road surface under the left wheels is different to the road surface un-
der the right wheels for a long period.
●when driving with snow chains.
Adjusting the tyre pressure settings (initialising the tyre pressure
monitoring system)
After any incident regarding the wheels of your vehicle, e.g. after modifying
the tyre pressure ⇒ page 253 or after changing or swapping wheels
⇒ page 253 you should - with the vehicle at a standstill and the engine run-
ning - press ⇒ Fig. 189. The yellow warning lamp will light up. Hold the
button down for 2 seconds until the warning lamp goes out and an acoustic
warning is given. You can now release the button.
If the wheels are subjected to extreme stress (e.g. heavy load), the tyre
pressure must be increased to the recommended value for the maximum
load (see the adhesive label on the inside of the fuel tank flap) and then
initialise the system.
Safety First Operating Instructions Practical Tips Technical Specifications
