They scan the computer. If'n you gotta CEL, you fail. I reset my computer right before I went and the sensors weren't ready yet; which the computer told the scanner; and I failed. I need to get rid of the CEL altogether and I'll be super fine. I already have homemade MIL eliminators; built exactly to a how-to I found on this site, and I've just got a different CEL code; this one for 'low voltage to O2 sensor' both cylinder banks.
