Do you drive a
1996 or newer car
or light truck?
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f so, you'll be glad to know that
your vehicle is equipped with an
early warning system that could
save you time, money, and
fuel in addition to helping
protect the environment!
How does the
system work?
Today's vehicles are highly
sophisticated and efficient. All
1996 and newer cars and trucks
have an advanced powertrain con-
trol computer that uses second
generation on-board diagnostics
(OBD-II) technology to manage
and monitor the operation of the
engine, transmission, and emis-
sions control components. OBD keeps your engine running at peak effi-
ciency and will alert you when repairs are needed.
How do I know the OBD system is work-
ing correctly?
When you turn on the ignition, the "Service Engine Soon" or "Check
Engine" light should flash briefly, indicating that the OBD system is
ready to scan your vehicle for any malfunctions. After this brief flash,
the light should stay off while you drive as long as no problems are
detected.
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What does it mean if the light turns on
while I'm driving?
If the light comes on and stays on, the OBD system has detected a
problem. Your vehicle might have a condition that wastes fuel, shortens
engine life, or causes excessive air pollution. If left unaddressed, these
conditions could also damage your vehicle and lead to increasingly
expensive repairs. For example, OBD can identify a loose or missing gas
cap (which wastes fuel and contributes to smog) or engine misfire
(which can lead to severe or permanent engine damage).
What should I do if the light stays on?
• There is no cause for panic. The vehicle is just telling you to seek
attention soon.
• When you reach your destination, make sure the gas cap is not loose
or missing. Always turn off your engine when refueling.
• If the light does not go out after a few short trips following gas cap
replacement or tightening, have your vehicle serviced by a qualified
repair technician soon! Delaying assistance could lead to more
expensive damage.
What does it mean if
the light is blinking?
If the light is blinking, a severe engine
problem such as a catalyst-damaging mis-
fire is occurring and should be addressed
as soon as possible. You can still drive
safely, but should minimize your time on
the road. Try not to drive the vehicle at
high speed or with excess weight (such as
towing or carrying heavy equipment).
What will my technician do when I take my
vehicle into the shop?
Ask your repair shop if they employ trained OBD technicians. A mod-
ern repair shop or dealership should have an OBD scan tool to diagnose
the cause of your vehicle's problem. These technicians will have the
proper tools and will know best how to diagnose your vehicle.
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The technician will connect a small, hand-held scanning device to your
vehicle's computer (usually through a connector under the dashboard)
and download information that can pinpoint the problem. The techni-
cian can then repair the vehicle based on manufacturer recommenda-
tions. OBD actually helps repair technicians do their job more quickly
and reliably, helping you avoid unnecessary repairs and trips back to the
shop.
What should I do if the light goes out
before I take the vehicle to the shop?
Usually, nothing. If the problem that caused the light to come on is
addressed, the OBD computer will turn the light off. This is not an
indication of a faulty OBD system. In fact, the system is doing its job by
verifying that a problem temporarily existed but has since been correct-
ed; perhaps a loose gas cap was tightened or fouled spark plug was
cleared. Your vehicle needs no special attention unless the light comes
on again.
What else can I do to
make sure my vehicle
is running well and to
minimize its environ-
mental impact?
Today's vehicles are highly sophisticated and efficient. OBD helps to
ensure these vehicles are running in top shape, but you still need to
maintain your vehicle according to the manufacturer's recommended
schedule. Keep up with routine maintenance and keep an eye out for
your Check Engine light. Always turn off the engine before refueling
and always make sure the gas cap is securely tightened. You'll save
money on fuel and repairs while helping to do your part to protect the
air you breathe. In addition, driving as little as possible by combining
trips, carpooling, walking, biking, or using public transit are all things
you can do to help minimize vehicle pollution.
For more information on OBD and vehicle inspection and maintenance programs, visit
ore-mail .
Office of Transportation and Air Quality
EPA420-F-02-016
August 2002
® Printed on paper that contains at least 50 percent postconsumer fiber.
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