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Make sure the gas tank is nearly,
but not completely, full (around
3/4).
Make sure the ambient
temperature is between 20° and
95°F.
Without touching the accelerator
pedal, start the engine and let it
idle for 20 seconds.
If you take your car for a state
emissions test shortly after the
battery has been disconnected or
gone dead, it may not pass the test.
This is because of certain ‘‘readiness
codes’’ that must be set in the on-
board diagnostics for the emissions
systems. These codes are erased
when the battery is disconnected,
and set again only after several days
of driving under a variety of
conditions.
Make sure the car has been
parked with the engine off for 8
hours or more.
Keep the car in Park (automatic
transmission) or Neutral (manual
transmission). Increase the engine
speed to 2,000 rpm and hold it
there until the temperature gauge
rises to at least 1/4 of the scale
(approximately 3 minutes).
If the testing facility determines that
the readiness codes are not set, you
will be requested to return at a later
date to complete the test. If you must
get the car re-tested within the next
two or three days, you can condition
the car for re-testing by doing the
following.
Testing of Readiness Codes
Technical Information
State Emissions Testing
408
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