Does ESTA approved, guarantee me admission to the US?

If your electronic travel authorization is approved, this approval establishes that you are eligible to travel to the United States under the Visa Waiver Program, but does not guarantee that you are admissible to the United States. Upon arrival in the United States you will be inspected by a Customs and Border Protection officer at a port of entry who may determine that you are inadmissible under the Visa Waiver Program or for any reason under United States law.

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A travel authorization is valid for two years after the application date or until the passport expiration date whichever happens first.

If you obtain a new passport or change your name, gender or country of citizenship, you will be required to apply for a new travel authorization.

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If your ESTA has expired, you must reapply by submitting a new application.

Your ESTA must be valid when you enter the U.S., if it expires during your stay it will not affect your departure.