HONDA 2004 S2000 - Owner's Manual - Manual (Page 170)

If you have recently refueled your
vehicle, the indicator coming on
could be a loose or missing fuel fill
cap. Tighten the cap until it clicks at
least three times. Tightening the cap
will not turn the indicator off
immediately; it takes at least three
days of normal driving.
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.
If your vehicle battery 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.
To check if they are set, turn the
ignition to ON (II), 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 5
times, the readiness codes are not
set. If possible, do not take your
vehicle for a state emissions test
until the readiness codes are set.
Refer to State Emissions Testing for
more information, on page
.
If this indicator comes on
while driving, it means one
of the engine’s emission 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
operation may cause serious damage.
If the indicator comes on repeatedly,
even though it may go off as you
continue driving, have your vehicle
checked by a dealer as soon as
possible.
188
Taking Care of the Unexpected
Malfunction Indicator Lamp
Readiness Code
167
NOTICE: If you keep driving with the
Malf unction Indicator Lamp on, you
can damage your vehicle’s emissions
controls and the engine. Those repairs
may not be covered by your vehicle’s
warranties.
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