Check engine light, Went to mechanic emissions error, replace hose, back on now. on 2003 Toyota Camry

Recently purchased my 2003 camry 90k miles on it. After driving it 100 or so miles, the check engine light came on, i took it to my mechanic and he replaced s few hoses due to an emissions error. The light reset and then I drove about another 120 and tonight the light came on again. I will update with codes when I get them, the car runs perfectly should i ignore the issue or what should i do exactly?

Asked by for the 2003 Toyota Camry
what i sthe code? post so we can adv