What exclusion would eliminate coverage for Sean's uninsured car if he has an accident with it?

The exclusion that would eliminate coverage for Sean's uninsured car following an accident is the one that addresses noncovered autos owned by the named insured or available for regular use. This exclusion specifically pertains to vehicles that the insured owns and are not listed or covered under the policy. If Sean's car is uninsured and not declared on his auto insurance policy, this exclusion would apply, resulting in the denial of coverage for any damages or liability incurred from an accident involving that vehicle.

Understanding this exclusion is crucial because it emphasizes the importance of listing all owned vehicles on an insurance policy to ensure they are covered. Additionally, it highlights the need for policyholders to be mindful of the vehicles they operate, as coverage is often tied to the vehicles explicitly mentioned in the policy.