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Malfunction Indicator Lamp
If the indicator comes on
while driving, it means one
If the indicator comes on repeatedly,
even though it may turn off as you
continue driving, have the vehicle
checked by the dealer as soon as
possible.
If the battery in your vehicle has
been disconnected or gone dead,
these codes are erased. It takes at
least three days of driving under
various conditions to set the codes
again.
of the engine’s emissions control
systems may have a problem. Even
though you may feel no difference in
your vehicle’s performance, it can
reduce your fuel economy and cause
increased emissions. Continued
To check if they are set, turn the
ignition to the ON (II) position,
without starting the engine. The
malfunction indicator lamp will come
on for 20 seconds. If it then goes off,
the readiness codes are set. If it
blinks five times, the readiness
codes are not set. If possible, do not
take your vehicle for a state
operation may cause serious damage. If you keep driving with the
malfunction indicator lamp on, you can
damage your vehicle’s emissions
controls and engine. Those repairs may
not be covered by your vehicle’s
warranties.
If you have recently refueled your
vehicle, the indicator could come on
because of a loose or missing fuel fill
cap. You will also see a ‘‘CHECK
FUEL CAP’’ message on the
odometer display. Tighten the cap
until it clicks at least once.
Tightening the cap will not turn the
indicator turn off immediately; it
takes at least three days of normal
driving.
This indicator may also come on
along with the ‘‘D’’ indicator.
emissions test until the readiness
State
codes are set. Refer to
Readiness Codes
Emissions Testing
for more
Your vehicle has certain ‘‘readiness
codes’’ that are part of the on-board
diagnostics for the emissions
systems. In some states, part of the
emissions testing is to make sure
these codes are set. If they are not
set, the test cannot be completed.
information (see page
254
).
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