Exhaust system maintenance
Emission Control System Caution -
Gasoline Engines
Your vehicle is equipped with a three-way cat-
alytic converter and lambda control. Therefore
fulfilling the current emissions regulations. Fol-
low our recommended maintenance instruc-
tions in order to ensure the proper operating
state of your vehicle.
Note the following:
a) Only refuel vehicles with a gasoline engine
with unleaded gasoline with a minimum of 87
octane according to the fuel pump. Refueling
using unsuitable fuel can cause damage to the
engine. You can find further information in the
"Operating fluids and filling capacities" section
of the vehicle Operating Instructions.
b) Under no circumstances refuel using leaded
gasoline. This would result in damage to the
emissions control system.
c) The specified maintenance work on the
engine must be performed in full and at the
required intervals. The correct ignition setting
and spark plugs which are in correct working
order are important, for example, for the cata-
lytic converters to achieve the maximum pos-
sible service life. If the specified maintenance
work is not performed properly, this can have
an adverse effect your vehicle's emissions
control system and its operating life.
d) Operation of the emissions control system
must not be modified in any way. Alterations
are not permissible by law. In addition, modifi-
cations could result in damage to catalytic
converters, to higher fuel consumption and to
a deterioration in the operating conditions of
the engine.
e) Operational irregularities in the engine must
be corrected immediately at an authorized
Mercedes-Benz Center. Irregular operating
conditions may adversely affect the proper
operation of the emissions control system.
If the Check Engine indicator lamp in the
instrument cluster lights up while the engine is
running, this is an indication of a potential mal-
function in the engine management or emis-
sions control system.
Description of Emission System
Maintenance Jobs
The composition of the exhaust gases is not
only influenced by the respective exhaust gas
cleaning system or the respective emissions
control system, but also by the various engine
components and their settings.
For this reason, maintenance of the exhaust
gas cleaning system or emissions control sys-
tem must also include maintenance of these
engine components. In practice, some of this
work only involves tests. Nevertheless, these
tests are important because irregularities,
which could at a later stage result in poorer
emission values, can be detected as early as
possible. It is generally more cost-effective to
have such issues remedied immediately,
rather than waiting until they result in a need
for expensive repairs. The maintenance inter-
vals have been determined so that the vehicle,
under normal operating conditions, should
operate properly between maintenance serv-
ices.
Changing engine oil and replacing
engine oil filters
Change engine oil and replace engine oil filters
in accordance with the specified service inter-
vals. If the oil consumption increases, you
must determine the reason and take the nec-
essary steps to remedy the problem. Do not
reset the service interval display if you have
refilled or changed oil outside the specified
service intervals.
Replacing the air filter
Replace the air filter in accordance with the
specified service intervals. In operating condi-
tions where large dust levels are generated,
the air filter must be replaced more regularly
than is indicated by the service interval dis-
play. Before removing it, clean the cover and
the housing of the air filter.
Replacing the fuel filter
(if applicable)
4
Description of Emission System Maintenance Jobs
Ma
int
enance
infor
ma
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Summary of Contents for Metris 2020
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