I found this, this morning about a possible fix. You guys that have lights and things, might want to look and see if yours is like the pictures....supposedly that is where its coming in.
http://www.cbsnews.com/news/ford-police-cruiser-carbon-monoxide-leaking/?ftag=YHF4eb9d17&yptr=yahoo
Ford's PR Department has been sending the message that CO leaks occur only in PIU's where they are caused by aftermarket add-ons and upfitting that leave holes unsealed in the body. But Ford's latest TSB 17-0044 on fixing odor leaks specifies 16 pages of other repairs, most of which involve adding sealant where none currently exists, such as along body seams, around wheel wells, and around the many holes drilled by Ford in the rear door, behind the tail lights, and underneath the body.
For example, there are 18 holes in the rear door just to hold the Ford Explorer lettering and logo, and each one needs to be sealed from the backside.
http://www.mhq.com/wp-content/uploads/2017/08/TSB-17-0044-Exhaust-Odor-in-Vehicle.pdf
The TSB also directs dealers to replace some parts with new versions, such as the rear air extractors, fasteners for the rear spoiler (which now have gas-tight washers) and the exhaust tips (which now have a 2nd hole facing down). This shows that Ford recognizes that some of its original parts are contributing to the "odor" problem and need to be replaced, regardless of their condition, just as the HVAC needs to be "reprogrammed." Other parts, like the exhaust manifold, are supposed to be visually inspected but not replaced unless found to be leaking.
But none of Ford's public statements acknowledge any flaw that may be Ford's fault except the cracked manifolds. Nor has Ford yet announced publicly that it issued another TSB in August instructing its dealers to fully refund all owners of civilian Ford Explorers for any exhaust odor repairs they may have paid for in the past under either TSB17-0044 or 16-0166.
http://www.mhq.com/wp-content/uploads/2017/08/Advance-Notice-Supplement-2.pdf
If this moves to a recall, it is going to cost Ford billions.