During the past three weeks, police have received reports of seven similar incidents across the city.
The carparks targeted include the Range on Water lane, Southernhay east, Waitrose and Sainsburys on Alphington Road.
A smartly dressed man is targeting lone older women and men, pretending he needs change for the ticket machine.
So far, around one-thousand pounds has been stolen.
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Devoncast - Police and Crime Commissioner election special
Devoncast is back with the latest from around the county
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