So finally got a code reader from amazon, read the instructions and plugged it in.
Pretty neat little unit actually.
I was able to determine that my check engine light is a result of code P2270 "O2 Sensor Signal Stuck" from $07E8.
I cleared the code, and of course the CEL went out, but the same code came right back as a "pending" code.
Any ideas what I should try next?