It sounds like you’re running into the error when using a save editor for Need for Speed: Carbon (likely NFS Carbon Save Editor by Vltor or similar tools like NFS-VltEd ).
The error means:
If you deleted a car or added a "Special" car (like Cross’s Corvette or a traffic vehicle) using a different mod tool, the Save Editor may struggle to read the heat data associated with that specific garage slot. Nfs Carbon Save Editor Invalid Car Heat Value
0x9A or similar depending on region).