The government must offer clear support to the motor trade when it publishes the Comprehensive Spending Review next month.
This is the view of the Society of Motor Manufacturers and Traders (SMMT), which acknowledged that there are "tough decisions" to be made as Westminster looks to reduce national debt.
However, it voiced concern about aspects of the emergency Budget published earlier this year, including the reduction in capital allowance for the industry.
Low-carbon technology needs to be given long-term support and investment, the SMMT said.
Chief executive Paul Everitt remarked: "Industry recognises the challenges facing government in reducing national debt while maintaining public services and fully supports plans to see a re-balancing of the economy."
His comments came as research published in August showed that new car registrations fell by 13.2 per cent in July following 12 months of successive rises.
Mr Everitt said this was expected due to the close of the scrappage scheme at the end of 2009 and falling consumer confidence.
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