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More than 20 cars have been broken into over the last 10 days according to Kent Police.
They are now warning residents in the Dover district to ensure their cars are locked when left unattended.
Two boys, aged 14 and two aged 15 and 16 from the Deal area have been arrested on suspicion of theft after a selection of cars were broken into in Sandwich.
They have been released on bail pending further investigation until March 24.
Det Insp Mark Weller said: “We cannot stress too strongly that car owners must double check that their vehicles are locked before they leave them.
“We are seeing an increase in thefts and it is very frustrating to discover that doors have been left open providing an open invitation.”
Officers believe that opportunists are walking along and flipping the door handles of parked cars to see whether they are locked.
Those that remain unlocked present a ready-made opportunity for thieves who are looking for sat navs, but won’t be fussy with what they take.
The police urge people not to leave anything on display and take your valuables with you.