I have done extensive searching on the web to find out if the '02 Jeep that was advertised as having a 4.7HO was actually a HO. What I'd found was if you look at the VIN the 8th digit (signifies engine family) needs to be a "J" to be a 4.7HO which is as you stated an EVC code. The non HO I believe is "N". The VIN is the easiest way to determine what the vehicle was built with. This link I found it pretty cool to decode a VIN. Plug the VIN in and it will actually bring up the build sheet with all the factory codes for the accessories, paint, interior, etc. It's not just what is available, it is the actuall build sheet. The jeep by the way does have the 4.7HO.