Check for applicable trouble codes/ security trouble codes. To check codes, at the least, you need an obd2 code reader. The security codes are P1 abd B codes, so if you get a code reader, make sure it will cover P1 and B codes, not just Po codes. Some of the national brand autostores will check codes for you. I don't know if they can check all different types of codes? I would be afraid to drive it with the security lite on.