: Tuners use software like WinOLS or ECM Titanium to access the Engine Control Unit (ECU) via the OBD-II port . They rewrite the code to restrict the vehicle's top speed to 30 km/h while allowing the engine to maintain its normal power for towing or climbing hills.

refers to bypassing or modifying the electronic speed limit (the "spärr") programmed into the Engine Control Unit (ECU).

Most users recommend using specialized companies for reliable results. For example, sites like ECU Testing

If you are looking for equipment or professional services to manage an ECU speed restriction, consider these specialized Swedish retailers and international tuning providers: TH-Pettersson