Call the guy up and ask him (last owner) where he got it installed and then take it to them and they will let you know within seconds if it has anything to do with the way they instaled the alarm.
Hey guys,
My engine light came on a few weeks ago, so I took it to the shop and they couldn't find anything wrong, so they cleared the computer and after a few days it came on again. $#@!#@$#$#!~!!!!