2002 Check Engine Light On

#1
I have a 2002 corolla with 140,00 miles on it, the check engine light came on and i had it read, guy at Knechts said it was a cooling system code, overcooling i think so i replaced the thermostat and the light came back on so it wasnt that. i can smell gas when driving it and he said cuz its running to lean, i am not a mechanic but i cant afford to take it to one, any ideas ?
 
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