It's not an unknown problem on the Passat, usually caused by the plastic cover over the caliper electrics having cracked & let in water & carp. Can usually be fixed DIY for £0 by dismantleling, cleaning & greasing, then repairing the cracked casing. But you are stuck between a rock & a hard place, immovable car stuck in the dealers. I belive the electrical mechanism that bolts to the back of the caliper & usually where the fault lies isn't available separately, so have to pay for the complete caliper assembly.
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