Aus dem Ventilbereich meines Ninebot-E-Scooters tritt Luft aus – was soll ich tun?

Check that if the valve is loose, or someone had made a prank and unscrewed it a bit.

Can be fixed with this kinda tool (if it is loose): https://www.motonet.fi/tuote/venttiilineulatyokalu-sieluavain?product=80-12794