Transportation accounts for almost one third of Sweden’s greenhouse gas emissions, of which passenger cars account for 61% (Fossil Free Sweden, 2020). However, the shift towards more sustainable mobility has accelerated in recent years, and Swedish car manufacturers have set ambitious targets for reduction. This shift is promising but implies great system-wide change including the development of new (or reformed) circular business ecosystems and business models to maximize resource effectiveness of the passenger car fleet over the whole product life cycle. To activate and coordinate this circular transformation of the car fleet, many aspects need to be considered in parallel with a systemic approach throughout the value chain. In a current project we aim to support new and established actors across the value chain to enable the development of a circular car towards 2045 through a systems perspective. The project, funded by Sweden's Innovation Agency Vinnova with support from FFI (Strategic Vehicle Research and Innovation), a collaborative program between the Swedish state and the automotive industry, involves nearly 20 partners from various stages of the car value chain. Building upon systems and trend analyses carried out in a 2023 pre-study, project partners have been engaged in a foresight process during the spring of 2024 to develop scenarios that describe different possible future states for Sweden's car fleet in 2045. Serving as input to subsequent work within the project (e.g., life cycle assessments and setting action plans), the scenarios will support the industry's transformation and help anticipate the needs for further collaboration across the value chain. The scenarios will guide and inform stakeholders of possible future threats and opportunities to better plan and make strategic priorities towards the future, allowing for the transition to a car fleet adapted for circularity.