The first thing I would do is have your guy check the fuel pressure. Low fuel pressure will cause all the misfire codes you have.
I would also have him check the compression to see if it is a engine issue causing this problem.
I would also have him check the back pressure for the catalytic converters. If the converters are clogged, it would also cause this issue.
As far as the warranty, no, it will not be covered unless it is an internal engine failure or if your transmission fails internally.
All the other external components are not covered in the warranty as they are all basic maintenance items and are the responsibility of the owner.
Wednesday, December 12th, 2018 AT 5:32 AM