'Stephen' is at least partly right on this one...
Massachusetts has a fairly strict policy on condition of car sales, called the "Lemon Aid Law".
"The Massachusetts Lemon Aid Law allows you to void or cancel a motor vehicle contract or sale if your vehicle fails to pass inspection within seven days from the date of sale AND if the estimated costs of repairs of emissions or safety related defects exceed 10% of the purchase price. (M.G.L. c. 90 §7N) This law applies to both dealer and private party sales of cars and motorcycles purchased for personal or family use. Dealers must display your Lemon Aid rights by putting a sticker on the left front window of each used car at the time of delivery."
In essence, this prevents a dealer from using an "as is" statement to release himself of any post-sale liability.
Detailed information:
http://www.state.ma.us/consumer/Pubs/lemonaid.htm
Now, I would suggest that we let this thread get back to the issues raised by IAAL.