I would buy a code reader and a o2 sensor DIY.
A code reader $35 +/s on Amozon to clear the code. Autozon won't clear code. The code won't mean anything to you---too many possibilities. o2 $100. replace the one you can see under the hood--the easier one then clear the code see what happens. The other o2 sensor is probably on the exausht-- hard to get to.