Thieves are stealing 22 'keyless' car and vans a day as gangs increasingly use cheap technology to hack into the vehicles' computer system, police have said.
Criminals can intercept data using a cheap electronic device and bypass the vehicle's on-board management system.
Police say some 22 vehicles a day are being stolen in this way in London and the West Midlands. In some areas it accounts for 42% of all car theft.
Watch ITV News' Consumer Editor Chris Choi's report.
Officers are now urging drivers to go back to using old-fashioned ways of protecting their cars from thieves such as steering or gear stick locks.