Ford Mystique Owner's Manual page 215

Do not make any unauthorized changes to your vehicle or
engine. Changes that cause more unburned fuel to reach the
exhaust system can increase the temperature of the engine or
exhaust system.
By law, anyone who manufactures, repairs, services, sells, leases,
trades vehicles, or supervises a fleet of vehicles is not permitted
to intentionally remove an emission control device or prevent it
from working. In some of the United States and in Canada,
vehicle owners may be liable if their emission control device is
removed or is prevented from working.
Do not drive your vehicle if it does not operate properly. See
your dealer if the engine runs on for more than five seconds
after you shut it off or if it misfires, surges, stalls, or backfires.
Information about your vehicle's emission control system is on
the Vehicle Emission Control Information decal located on or
near the engine. This decal identifies engine displacement and
gives some tune-up specifications.
How to Prepare Your Vehicle for
Inspection/Maintenance (I/M) Testing
In some localities it may become a legal requirement to pass an
Inspection/Maintenance (I/M) test of the On-Board Diagnostic
(OBD) II system. If the vehicle's powertrain system or its battery
has just been serviced, the OBD II system is reset to a not ready
for I/M testing condition. To prepare for I/M testing, the law
specifies that additional mixed city and highway driving is
required to complete the check of the OBD II system.
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