Some editors handle invalid values gracefully. Try:
If you're still experiencing problems, providing more details about the save editor you're using and the exact steps you take to encounter the error might help in finding a more specific solution. Nfs Carbon Save Editor Invalid Car Heat Value
Here’s a useful, technically focused write-up on the “Invalid Car Heat Value” error in Need for Speed: Carbon save editors—why it happens, how to fix it, and how to avoid it. Some editors handle invalid values gracefully
The most frequent cause. In Carbon, your Career garage and your Challenge Series garage are separate, but save editors sometimes blend them. If you copy a car from Challenge Series (where heat values are relaxed) directly into your Career save without recalculating the heat flag, the editor sees a mismatch. The most frequent cause
Many save editors rely on an external carlist.xml or carbon_cars.xml file. If this file is outdated, the editor doesn't know what heat value a car should have. Download the latest community car list from NFSCars.net. Place it in the editor's root folder. This single fix solves 90% of errors.
Do not import cars from a 100% Challenge Series save directly into a fresh Career save. The game flags cars differently. Instead, use the editor to "nullify" the car first (set it to a default vehicle), then change it to your target.
Many old forums link to version 1.0 of NFS Carbon Save Editor. This version is buggy. You need Version 2.1 or higher (preferably the final release by Voss). The newer versions have automated heat correction. Download from reputable modding sites like NFSCars.net or GitHub archives.