They don't get "reset." Did you recently change out your catalytic converter? Sometimes new exhaust components will mess with your older sensors causing the computer to go whack. If you haven't already, replace your o2 sensors, both of 'em if you can. Might as well while somebody's under there if you haven't already. If your check engine light stays on, you may need to get a computer diagnostic. Some places charge $60 for these, but if you know a cool mechanic, and just get the oil changed, they might just do it for free.
Hope that helps.
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