The CAR Customization Analysis Report is a Microsoft Excel report.This report contains details of your customizations & artifacts, extension models, best practices issues, errors & warnings.
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****** Run the below command in cmd ******
xppbp.exe -metadata=<local packages folder> -all -model=<ModelName> -xmlLog=C:\BPCheckLogcd.xml -module=<PackageName> -car=<reportlocation>
For example
xppbp.exe -metadata=C:\Packages -all -model=”MyAppSuiteCustomizations” -xmlLog=C:\temp\BPCheckLogcd.xml -module=”ApplicationSuite” -car=c:\temp\CAReport.xlsx
********The xppbp.exe tool is located in c:\packages\bin or I:\AosService\PackagesLocalDirectory\bin ********
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For more detail, please refer below link