Troubleshooting
Please refer to , and on page
326 and and at the start of the
chapter on page 341.
12-volt vehicle battery
T
he warning lamp lights up red. A message
is shown on the instrument cluster display.
Do not drive on! T
his can result in dam-
age to the electrical system.
1. Stop the vehicle as soon as possible
and when safe to do so.
2. Switch o any electrical consumers
that are not required.
3. Seek expert assistance.
Auto StartStop cannot start the engine
→ page 157.
12-volt vehicle battery
The indicator lamp lights up yellow. A mes-
sage is shown on the instrument cluster
display.
1. Go to a suitably qualified workshop.
Or: drive a short distance to recharge
the 12-volt vehicle battery.
Wheels and tyres
Intr
oduction
The wheels are the most used and most
underestimated parts of a vehicle. Wheels
are very important as the narrow surfaces
of the tyres are the only contact between
the vehicle and the road.
The tyres and wheel rims approved for the
vehicle have been carefully selected.
The service life of tyres is dependent on
tyre pressure, driving style, handling and
correct fitting.
We recommend having all work on the
wheels performed by a suitably qualified
workshop. They are familiar with the proce-
dure and have the necessary special tools
and spare parts and the proper facilities for
disposing of the old tyres.
Wheel rims, tyres and wheel bolts
Wheel rims, tyres and wheel bolts are
matched to the vehicle type. If the wheel
rims are changed, wheel bolts with the cor-
rect length and cap form must therefore be
used. This ensures that the brakes can
function correctly and that the vehicle
drives smoothly and safely. For technical
reasons, it is not generally possible to use
the wheel rims from other vehicles. This
can also even apply to wheel rims of the
same vehicle type. If you wish to switch to
a dierent tyre and wheel rim combination,
always consult a suitably qualified work-
shop.
The correct wheel bolts must always be
used for each vehicle type and these must
always be tightened with the correct tight-
ening torque → page 352.
WARNING
Incorrect handling of wheels and tyres
c
an reduce vehicle safety and cause seri-
ous accidents and fatal injuries.
·
Check the tyre pressure regularly when
the tyres are cold and always observe
the specified value → page 350. If the
tyre pressure is too low, it is possible
that the tyre temperature will increase
346
Wheels and tyres
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