Volkswagen owners caught up in the Dieselgate scandal claim their cars have developed potentially life threatening faults.
Some drivers say it meant their car rapidly decelerating to 20mpg while going along. The claims echo those reported in the Mirror in April this year.
We revealed how, of 37,000 owners who had contacted a law firm leading a class action against VW, 10,000 had taken their cars for what was meant to be a routine update.
Yet, of those, around 3,500 said their cars later had issues. The law firm, Harcus Sinclair, is carrying out a wider survey.
One owner, Lisa Bryant-Jones, from Chepstow, Monmouthshire, told BBC Watchdog how her VW Passat kept going into limp mode after the device linked to the diesel emissions scandal was removed.
On one occasion, when she had to manoeuvre the car off the road, the vehicle was hit by a lorry.
She and her son who was also in the car were unharmed but she says the car was written off.
Ms Bryant-Jones sold the programme she would “never buy another Volkswagen car again”.
There is no evidence that the apparent flaws are linked to the software tweak.
VW told BBC Watchdog: “In the UK, the Volkswagen Group has implemented the technical measures in more than 720,000 vehicles and in over five million vehicles across Europe.
“To be clear, there is no systemic problem. The overwhelming majority of our customers have been fully satisfied.”