[UFO]

I have modified the circuit and verified it with VAG-COM that is is not setting the CEL. I left the MAF target at 270, where it has always been (I can't adjust it anyway, my VAG-COM is not registered.) To partially offset the loss of EGR warm-up, I installed a grille block.

I also have a 2-tank baseline (more or less) with the EGR connected using mostly pump diesel. The grille block opening is a bit too small, I peaked 215 coolant temperature on my morning drive, so I cut it out a bit more - it's just cardboard for now. I intend to keep the grille block for the portion of the mileage test when I reconnect the EGR.