Would it be possible to make a special appointment with the dealer ship so you can have someone ready to take a test drive with you AFTER you have driven it for 45 minutes or so to ensure it will fail soon after you take your test drive? This way you don't waste any of their precious time.
It's like the car is innocent until proven guilty.
Ingot Silver SEL Sedan w/303A, winter pkg, remote start, Arctic White Interior
If in doubt, pull fuse 67 and 79.