Jeep Patriot 2011 Operating Information Manual page 202

ONBOARD DIAGNOSTIC SYSTEM —
OBD II
Your vehicle is equipped with a sophisticated
onboard diagnostic system called OBD II. This
system monitors the performance of the emis-
sions, engine, and automatic transmission con-
trol systems. When these systems are operat-
ing properly, your vehicle will provide excellent
performance and fuel economy, as well as
engine emissions well within current govern-
ment regulations.
If any of these systems require service, the
OBD II system will turn on the "Malfunction
Indicator Light" (MIL). It will also store diagnos-
tic codes and other information to assist your
service technician in making repairs. Although
your vehicle will usually be drivable and not
need towing, see your authorized dealer for
service as soon as possible.
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CAUTION!
• Prolonged driving with the MIL on could
cause further damage to the emission con-
trol system. It could also affect fuel
economy and drivability. The vehicle must
be serviced before any emissions tests can
be performed.
• If the MIL is flashing while the engine is
running, severe catalytic converter damage
and power loss will soon occur. Immediate
service is required.
Loose Fuel Filler Cap Message
After fuel is added, the vehicle diagnostic sys-
tem can determine if the fuel filler cap is
possibly loose or improperly installed. A "gAS-
CAP" message will be displayed in the instru-
ment cluster. Tighten the gas cap until a click-
ing sound is heard. This is an indication that
the gas cap is properly tightened. Press the trip
odometer RESET button to turn off the mes-
sage. If the problem persists, the message will
appear the next time the vehicle is started. This
might indicate a damaged cap. If the problem
is detected twice in a row, the system will turn
on the MIL. Resolving the problem will turn the
MIL light off.
REPLACEMENT PARTS
Use of genuine MOPAR parts for normal/
scheduled maintenance and repairs is highly
recommended to ensure the designed perfor-
mance. Damage or failures caused by the use
of non-MOPAR parts for maintenance and
repairs will not be covered by the manufactur-
er's warranty.
MAINTENANCE PROCEDURES
The pages that follow contain the required
maintenance services determined by the engi-
neers who designed your vehicle.
Besides those maintenance items specified in
the fixed maintenance schedule, there are
other components which may require servicing
or replacement in the future.