Reset ECU?

Hello everyone

Today one of my classmates thought it would be funny to disconnect the airflow sensor from my air filter. Resulted in weird idle rpm's and couldn't go above 2000rpm. I reconnected the sensor and fired it up again, drove home, but on my way home I noticed the engine error light was on. There seems no way to turn this off, I already tried disconnecting the '+' from the battery for 10 minutes. What could be a possible solution?
 
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