Are you sure your scanner can read ABS codes? If it can, check simple things such as brake fluid level, park brake switch.
As far as the converter, chances are it needs replaced again. Since it is only 2 years old and you only put 40K miles on it, it should still be under warranty. Most any converter that I have seen come with a minimum 5 year or 50K mile warranty.
Friday, March 13th, 2015 AT 5:06 AM