I just received my 2015 sonata back from hyundai on Thursday, with a new motor replacement. The next day my check engine light came on. The code is PO13700, 02 bank 1 sensor 2 cercut low voltage. I payed the service dept. Almost 1800$ to replace all hoses and what ever else was attached to the motor. IS that sensor part of the replacement? I am feeling like I'm being nickeled and dimed to death with this car! Or maybe it's covered by the warranty?