my check engine light came on today so i went down to autozone and read the code they came back as PO153 PO171 and PO174 i know that they have something to do with O2 sensors but i was wondering if anyone could tell me witch ones they are or if they might be something else besides O2 sensors? thanks!

 

It may have an exhaust leak, vaccum leak, PCV or connection problem. These may help. http://www.obd-codes.com/p0153 http://www.obd-codes.com/p0171 http://www.obd-codes.com/p0174

Also, cleaning the MAF may help too.