Are you using a specific mod like or Extra Options , or is this happening on a vanilla installation?
Before editing a car’s heat, :
Still no success? Your game save might be beyond repair. Use a from a trusted source (like NFSCars.net) and edit that instead. Those saves are community-verified to have clean heat values. Nfs Carbon Save Editor Invalid Car Heat Value
The "Invalid Car Heat Value" error typically occurs when using a save editor to modify your Need for Speed: Carbon game save. The save editor is a tool that allows players to make changes to their game save, such as modifying car stats, adding new cars, or changing gameplay settings. However, when the save editor encounters an invalid or corrupted value, it throws an error message, preventing you from saving your changes. Are you using a specific mod like or
Not all save editors are equal. Based on forum threads (NFSAddons, NFSCars.net, Reddit’s r/needforspeed), these tools have the fewest heat value issues: Use a from a trusted source (like NFSCars