Its easy to do it yourself.
Go to napa and buy a O2 sensor socket (I think they are like $15)
Jack up the car with the factory jack in your trunk or borrow one
take the passenger front wheel off
disconnect the NEG cable on the batt
unplug the O2 sensor
remove the sensor
now back track and put it all back together
took me 5 min to do mine a week or 2 ago
HOWEVER, I would also suggest checking for a boost leak as well but if not, thats your choice
good luck if you decided to do it yourself!