"There is a car" says that a car exists or is present (in some place that is relevant to the context). "There is a car there" says that a car exists or is present in the place identified by "there". To the extent that "there" means "some place that is relevant to the context", the effective difference between the two may be small.
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tntenglishmaster Are they same sentences?Obviously not. The second sentence has one more word than the first.