The xD's TPMS system will need reprogrammed for the new ID's of the TPMS sensors from the tC... you may have to have the dealer do that, don't know if a tire shop is able to do that... probably cheaper than swapping sensors - 8 dismounts, 8 re-mounts, and 8 tire balances is quite expensive! Another possibility, Did you verify there is actually TPMS inside those tC wheels? If they were from a tC 2007 or earlier the there might not be any TPMS in those, TPMS wasn't a requirement until cars made after September 2007...
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