Mercedes-Benz 300 SE Operator's Manual page 92

Emission Control
Certain systems of the engine serve to
keep certain components of the exhaust
gases within permissible limits required
by law.
These systems, of course, will function
properly only when maintained strictly
according to factory specifications.
Any adjustments on the engine should,
therefore, be carried out only by
qualified Mercedes-Benz technicians.
Engine adjustments should not be
altered in any way. Moreover, the
specified service and maintenance jobs
must be carried out regularly according
to Mercedes-Benz servicing
requirements. For details refer to the
Maintenance Booklet.
Warning!
Inhalation of exhaust gas is
hazardous to your health. All
exhaust gas contains carbon
monoxide, and inhaling it can cause
unconsciousness and lead to death.
Do not run the engine in confined
areas (such as a garage) which are
not properly ventilated. If you think
that exhaust gas fumes are entering
the vehicle while driving, have the
cause determined and corrected
immediately. If you must drive
under these conditions, drive only
with at least one window fully open.
On-Board Diagnostic System SL 500
(California version only); other
models (all states)
The Sequential Multiport Fuel Injection
(SFI) control module monitors emission
control components that either provide
input signals to or receive output
signals from the control module.
Malfunctions resulting from
interruptions or failure of any of these
components are indicated by the
"CHECK ENGINE" malfunction
indicator lamp in the instrument cluster
and are simultaneously stored in the
SFI control unit
If the "CHECK ENGINE" malfunction
indicator lamp comes on, have the
system checked at your authorized
Mercedes-Benz dealer as soon as
possible.
An on-board diagnostic connector with
pushbutton and light emitting diode
(LED) is located on the engine
compartment firewall, allowing the
accurate identification of system
malfunctions through the readout of
diagnostic trouble codes.
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