The Nissan and Renault 1.2 L petrol engines have been reported to experience misfiring issues, which can manifest as jerking movements, loss of power, or irregular idling. Common causes of this problem include faulty spark plugs, ignition coil failures, and issues with the fuel system or exhaust sensors. Addressing these concerns promptly is essential for maintaining engine performance and vehicle safety. Owners experiencing such problems should seek diagnostic services to pinpoint the exact cause and perform the necessary repairs.