If you purchased a vehicle for which you can get an energy credit, and you purchased it in 2021, then you have to enter that on your 2021 tax return. You have provided no details about the car, so we do not know if it qualified for credit or for how much. Amend your 2021 return to include it
See this TurboTax support FAQ for amending a tax return - https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/amend-change-correct-return-a...
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