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Who is responsible for compliance of a vehicle component?

If a road vehicle component has a Component Type Approval (CTA), the holder of the CTA will be responsible for the compliance (or any non-compliance) of the component.  If a Vehicle Type Approval is granted using a component(s) that does not have a CTA (other evidence has been used to prove compliance to the relevant ADR), then the holder of the vehicle approval will be responsible for compliance of the component.