What is the difference between a dodge 5.2 liter and a 5.9 liter How can I tell which engine I have in my 2001 Dodge 1500?

USA a VIN decoder. All you should have to do is type in your VIN (found on your dash, driver's side, view it from the outside...or inside the driver door) and it should decode it and tell you a variety of information...engine included.

http://www.decodethis.com/