Got the code last Wednesday, ordered the parts that day figuring the code would stick around and it's one I'd want to fix relatively quickly. And this past weekend, the CEL cleared on its own. Oh, well...207,000 miles on her so I'll just replace the parts anyway. Seems like an easy enough task.
Update: I spoke too soon. Same CEL code came on this morning on the way to work. It's just as well, I suppose. At least the parts I ordered are actually needed and won't just be for preventative purposes.