Hundreds of keyless cars are vulnerable to high-tech theft, new report says

The Ford Fiesta is one of the keyless car models vulnerable to theft, according to the report.

(CNN)More than 200 car models that offer keyless entry are susceptible to theft, a report from British consumer group Which? has revealed. The models at risk include four of the five bestselling cars in the UK, produced by Ford, Volkswagen and Nissan.

The vehicles can be stolen using "cheap electronic equipment" purchased online, Which? said. Of the top five most popular cars in the UK -- the Ford Fiesta and Focus, the Volkswagen Golf, the Nissan Qashqai and the Vauxhall Corsa -- only the Corsa cannot be stolen using this technology, because it does not offer a model with keyless entry.
While these systems require a fob to be within a certain proximity of the car to unlock and start it, thieves can use relay boxes to boost the fob's signal. This tricks the system into believing the fob is near the car, Which? explained -- even if it's actually inside the owner's house.
Testing carried out by the German General Automobile Club demonstrated that of 237 keyless car models, 230 could be both unlocked and started using relay technology, while four models could be either unlocked or started.
    Further makers with vulnerable models included Honda, Audi, Hyundai, BMW, Kia, Skoda, Volvo, Peugeot and Renault.
    Three models were impervious to the relay technology, all from Jaguar Land Rover: the most recent versions of the Discovery, the Range Rover, and the i-Pace.
    The affected manufacturers, Which? said, have "sacrificed the security of scores of modern cars for the sake of convenience." All of the manufacturers excluding Honda told Which? that they prioritize their cars' security against theft, and are looking for ways to improve it.