Honda 2001 NSX Owner's Manual page 262

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Readiness Codes
Your car 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 car's battery has been
disconnected or gone dead, these
codes are erased. It takes several
days of driving under various
conditions to set the codes again.
If possible, do not take your car for a
state emissions test until the
readiness codes are set. See State
Emissions Testing on page
Malfunction Indicator Lamp
283 .
Taking Care of the Unexpected