2002 Nissan Altima "set timing marks 02 jeep" Questions

timing marks on all three chains were not aligned and had to ALL be set- I guess they might do that to prevent the parts from re-entering the 'system'? Or, some dumb s__t at the factory was new and/or

...02 T4R. Last week I noticed the *chirp* sound wasnt working any more. Over the weekend... the Keyless Remote stopped working totally. So I radio shacked a new battery in the remote... but it still ...