Should still be under warranty if its a 2013. Sucks but it might be time to take it to the dealer. Often they will give you a free dealer rental to tool around in for warranty issues.
2000 Mustang GT Steeda #0048 34k miles. 99 Cobra 4V swapped, FTBR IRS swapped, exhaust, tuned by James Gordon.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.