BMW Z4 Roadster, Owner'S Handbook Manual

Page: 253 / 344

General driving information
Closing the boot lid
Safety note
WARNING
When open, the boot lid protrudes above the
vehicle, and in the event of an accident, braking
or evasive manoeuvres, it can endanger vehicle
occupants and other road users, or damage the
vehicle. Exhaust fumes may also enter the pas‐
senger compartment. There is a danger of in‐
jury or damage to property. Do not drive with
the boot lid open.
Driving with the boot lid open
If there is no alternative to driving with the tail‐
gate open:
▷ When the convertible top is closed, close all
the windows.
▷ Turn up the blower to a high setting.
▷ Maintain a moderate speed.
Hot exhaust system
WARNING
During vehicle operation, high temperatures
may occur under the vehicle body, for example
due to the exhaust system. If flammable materi‐
als, for example leaves or grass, come into con‐
tact with hot parts of the exhaust system, these
materials can catch fire. There is a danger of in‐
jury or damage to property. Never remove the
heat shields fitted here or apply underseal to
them. Make sure that when driving, idling or
parking, no flammable materials can come into
contact with hot vehicle parts. Do not touch the
hot exhaust system.
Exhaust gas particle filter
Principle
The exhaust gas particle filter collects soot parti‐
cles. The soot particles are burned at high tem‐
peratures to clean the exhaust gas particle filter
as necessary.
General
The cleaning process takes a few minutes, dur‐
ing which the following may occur:
▷ Engine temporarily runs a bit roughly.
▷ A slightly higher engine speed is required to
achieve the usual power output.
▷ A small amount of smoke from the exhaust,
even after stopping the engine.
▷ Noise, for example caused by the radiator fan
running, even some minutes after stopping
the engine.
It is normal for the radiator fan to keep running
for several minutes, even after short trips.
Cleaning the exhaust gas particle
filter while driving
Various driver profiles ensure that the exhaust
gas particle filter is self-cleaning. If, in addition to
the self-cleaning function, the exhaust gas parti‐
cle filter needs to be actively cleaned while driv‐
ing, a Check Control message is displayed.
Proceed as follows the next time you drive out‐
side of built-up areas for around 30 minutes:
▷ Deactivate cruise Control systems.
▷ Take your foot off the accelerator repeatedly
and allow the vehicle to roll in overrun mode,
see page
257 .
▷ If possible, drive at alternating speeds.
Seite 253
Driving precautions
DRIVING HINTS
253
Online Edition for Part no. xxx - X/18