Just wondering. Had the snow tires mounted today on the 2016 Touareg I bought recently. They are the same tires I mounted annually on the 2012 I traded in, and that worked flawlessly. This TPMS is not connecting, with no reading on any wheel, after driving more than 20 miles. The new OEM tires that came off are 265/50R19 (same size as on the 2012) , and the snow jobs are 255/55R18. The profile difference results in no or little speedometer error. The owner's manual refers to a recalibration which has to be made by VW service. Don't recall having to do that with the previous car. Is that the need to upload the car's database with an additional set of tires, even though the diameter is nearly identical? Or will it need to be done each time I switch?