Mercedes-Benz A 220 4MATIC 2021, Operator'S Manual

Page: 294 / 426

pressure telltale when one or more of your
tires is significantly underinflated. Accord‐
ingly, if the low tire pressure telltale illumi‐
nates, you should stop and check your tires
as soon as possible, and inflate them to the
proper pressure. Driving on a significantly
underinflated tire causes the tire to overheat
and can lead to tire failure. Underinflation
also reduces fuel efficiency and tire tread
life, and may affect the vehicle's handling
and stopping ability. Please note that the
TPMS is not a substitute for proper tire main‐
tenance, and it is the driver's responsibility
to maintain correct tire pressure, even if
underinflation has not reached the level to
trigger illumination of the TPMS low tire pres‐
sure telltale.
Your vehicle has also been equipped with a
TPMS malfunction indicator to indicate when
the system is not operating properly. The
TPMS malfunction indicator is combined with
the low tire pressure telltale. When the sys‐
tem detects a malfunction, the indicator
lamp will flash for approximately a minute
and then remain continuously illuminated.
This sequence will continue upon subsequent
vehicle start-ups as long as the malfunction
exists.
When the malfunction indicator is illumina‐
ted, the system may not be able to detect or
signal low tire pressure as intended. TPMS
malfunctions may occur for a variety of rea‐
sons, including the installation of incompati‐
ble replacement or alternate tires or wheels
on the vehicle that prevent the TPMS from
functioning properly.
Always check the TPMS malfunction telltale
after replacing one or more tires or wheels
on your vehicle to ensure that the replace‐
ment or alternate tires and wheels allow the
TPMS to continue to function properly.
The system checks the tire pressure and the tire
temperature of the tires installed on the vehicle
by means of a tire pressure sensor.
The tire pressure and the tire temperature
appear in the on-board computer (
/
page 293).
If there is a substantial pressure loss or if the
tire temperature is excessive, you will be warned
in the following ways:
R
via display messages (
/
page 372).
R
via the h warning lamp in the instrument
cluster (
/
page 392)
The tire pressure monitoring system is only an
aid. It is the driver's responsibility to set the tire
pressure to the recommended cold tire pressure
suitable for the operating situation.
In most cases, the tire pressure monitoring sys‐
tem will automatically update the new reference
values after you have changed the tire pressure.
You can, however, also update the reference val‐
ues by restarting the tire pressure monitoring
system manually (
/
page 392).
System limits
The system may be impaired or may not function
particularly in the following situations:
R
The tire pressure has been set incorrectly
R
Sudden pressure loss caused by a foreign
object penetrating the tire, for example
292 Wheels and tires