Hello
I have had this same issue with the exhaust oder within the cabin. The catalytic converter was replaced because of a crack that had developed. Issue resolved.
I will be visting my local Ford dealer with this same issue. I smell exhaust fumes in the cabin. It has gotten stronger to the point where I will nolonger drive it. I have been told that it may be several days before the cause can be found. I will inform them that it may be the catalytic...