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1996 and later. http://www.epa.gov/obd/

It says on the page "It works with just about any car sold in the United States since 1996." It's been mandatory for all car manufacturers in the US since 1996.

Any car with a OBD II port should work with the device... just Google your car. As noted, it's basically anything after 96 save for Hondas and a few other models.

"Save for Hondas and a few other models."

How does that work? There's 11 counties in Wisconsin where you cannot register your car unless you pass a biannual smog check which for any post '96 car involves the OBD-II check for codes and readiness indicators. So no ODB-II port means no wisconsin license plate with very few exceptions (mainly antique cars and electric cars)