The woman, whose identity wasn't released, was arrested on suspicion of smuggling and was placed in the custody of Border Patrol. The car and cash were seized, according to a press release from Customs and Border Protection.
Last year, officials said they confiscated $290,000 from a man who was also driving south on I-5 near Oceanside.
In August 2016, they made the biggest currency seizure in the San Diego area when they discovered two cars on the 15 Freeway carrying more than $3 million.
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