Hey names Mike, I just bought a used 2015 wrx limited 2.0L and i now have a check engine light on, so I took it to Auto Zone to get a read in it and when they plugged it up they didn’t give me an exact number they just said it was my cat converter.. I only have 78,000 miles on it. An auto shop told me by some law their is a eight n eighty warranty that covers all calls below the 80k mile range, is that a thing? And also is it really the cat converter or could it be an O2 sensor or leaking exhaust? Thanks in advance for any help I’m new to the subie world.