Darian,
"Two questions for you guys-
If you change the batteries in the remotes do you need to re-set or enter the codes etc? Or is it just replace them and use as per normal?
**Just replace & use as per normal. You may have to lock unlock the vehicle to re-sync the keys.
If you change the barrel I'm assuming that you will need new keys as well? Or do they just modify them to suit?"
**The locksmith should be able to recode the barrel (albeit new/used) to the existing keys you have. It is also easier for the locksmith if you have the 4 digit ignition key code. Supply the locksmith with the barrel, original key & code & he should be able to get it running for you.
Cheers.

