The company contacted the Vehicle Inspectorate after the issue with the Megane's bulk-head-mounted brake mechanism came to light last week.
A cam connected to a rod from the brake pedal can be accessed in the top right of the passenger footwell. A passenger sitting in the front seat could feasibly reach the cam with their right foot and inadvertently apply the brakes, slowing the car and activating the rear brake lights.
Although the issue would not appear to pose a safety risk under normal driving conditions, the factory is working on a modification that will be fitted to all new Meganes within weeks and will be available as a retro-fit for existing customers.
The Vehicle Inspectorate decided a full product recall was not necessary but the modification would be fitted to existing vehicles during their next service.
While three-door and five-door versions of the Megane are affected, as well as the Coupe-Cabriolet, Sport Saloon and Sport Tourer, both the Scenic and Grand Scenic do not suffer from the problem.
Customers will soon be contacted to inform them of the availability of the modification and answer any questions they might have.
Renault managing director Philippe Talou-Derible said: 'Safety is Renault's top priority at all times and we have an exemplary safety record.'