If I were you, I would buy a multimeter(or two...one standard one, and one with a current clamp capable of reading DC amps) and a scan tool at least capable of reading engine data on those LQ1's. Both will pay for themselves many times over if you do your own diagnostic work. There's tons of documentation online these days to help you get started using either tool. If you want some recommendations for either, let me know(buying all the stuff I recommended would be far cheaper than a single dealership visit by the way).