2003 Pontiac Montana Owner's Manual - Page 220

2003 Pontiac Montana Manual

Page 220 highlights

The SERVICE ENGINE SOON CHECK ENGINE light or comes onto indicate thatthere is a problem andservice is required. Malfunctionsoften will be indicated by the system before any problem is apparent. This may prevent more serious damage toyour vehicle. This system is also designed to assist yourservice technician in correctly diagnosing any malfunction. Notice: If you keep driving your vehicle with this light on, after a while, your emission controls may not work as well, your fuel economy may not be as good and your engine may not run as smoothly. This could lead to costly repairs that may not be covered by your warranty. Notice: Modifications made to the engine, transaxle, exhaust, intake or fuel system of your vehicle or the replacement of the original tires with other than those of the same Tire Performance Criteria (TPC) can affect your vehicle's emission controls and may cause this light to come on. Modifications to these systems could lead to costly repairs not covered by your warranty. This may also result in a failure to pass a required Emission Inspection/Maintenance test. 3-43

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The
SERVICE
ENGINE
SOON or CHECK
ENGINE light
comes
on
to indicate
that
there
is
a
problem
and service
is required.
Malfunctions often will be indicated by
the
system before any problem is apparent. This may prevent
more serious damage
to your vehicle. This system is also
designed to assist
your service technician in correctly
diagnosing
any malfunction.
Notice:
If
you keep driving
your
vehicle
with
this
light on,
after
a
while,
your
emission
controls
may not
work as well, your
fuel
economy
may
not
be as good
and
your
engine
may
not
run as
smoothly.
This
could
lead
to
costly
repairs
that
may
not
be
covered
by
your
warranty.
Notice:
Modifications
made
to
the
engine,
transaxle,
exhaust,
intake
or
fuel
system
of
your
vehicle
or
the
replacement
of
the
original
tires
with
other
than
those
of
the
same
Tire
Performance
Criteria (TPC) can
affect
your
vehicle’s
emission
controls
and
may
cause
this
light
to
come
on.
Modifications
to
these
systems
could
lead
to
costly
repairs
not
covered
by
your
warranty.
This
may
also
result
in
a
failure
to
pass
a
required
Emission
Inspection/Maintenance
test.
3-43