In Dutchess County - 1 hour north of NYC:
OBDII vehicles ALL must be plugged in to communicate with the computer now. There may be exceptions but I don't know any.
Older than 10 years = no sniffer test, but technically must still have all OEM pollution devices in place. Visual test for this is usually very easy to pass - if it looks like it's there you are good.
96, 97, 98 240SX with SR have a big problem - one reason I don't own one!
-------------------------------------------Jeff HHeavy Throttle Performancehttp://
www.heavythrottle.com