Im pretty cool with my dealer's parts guys. If you ask nicely and explain your problem, they will probably give you one to try in the bay to see if it fixes the problem. If it goes off, buy it, if not, tell them you'll be back when you know what it is.
<span style='color:gray'><span style='font-family:Courier'>1995 e36 3 Series RIP
1999 e46 3 Series BURN IN HELL
2000 MR-S Roadster= Current</span></span>