Guys i have a 2007 manual Tiida with 38000kms 4 days a go i went to the exhaust shop... we did a check on the cat converters and we decided to open them, now they look original on the outside but clean or open (free) on the inside, now the response is better the fuel comsumption is lower and it seems to improve the car`s performance because is faster now.
Today at 11am i went to a gas station pumped my car until full and everything was perfect until 40 min a go. 1 block away from home my service light went on. After shut off the car and re-start the light goes off for some seconds and then appears again.
What should i do?reset the computer? run the car until the gas goes out? what do you guys recomend?

Please excuse my english if i made a mistake writing.