What might be making you a tad apprehensive, but might not, as it's too soon to tell

[glatt]

Sitting in the state inspection waiting area, hoping our '96 Geo Prizm makes it. Emissions always worry me because I don't understand the test. What does that anal probe measure? Plus the steering belt squeals, and sometimes the brake light comes on, but not this morning. Brakes should be good mechanically though. I think it's a dirty sensor or something. Hope we pass...