Mercedes-Benz C-Class 2006 Maintenance Booklet page 15

d) The operation of the emission con-
trol system must not be altered in
any way. Alterations are not permissi-
ble by law. In addition, alterations may
result in damage to the catalysts, in-
creased fuel consumption, and im-
paired engine running conditions.
e) Irregular engine running conditions
should be corrected immediately by
an authorized Mercedes-Benz Center.
Such irregular running conditions can in-
fluence the proper function of the emis-
sion control system.
Maintenance Booklet
Emission System Maintenance
If the "CHECK ENGINE" indicator lamp in
the instrument cluster illuminates when
the engine is running, it indicates a possi-
ble malfunction of the engine management
system or emission control system.
We recommend that you have the malfunc-
tion checked as soon as possible.
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