The Porsche, driven by Jeremy Clarkson for a special episode in South America, had the registration number H982 FKL.
The number plate sparked anger in Argentina and the cast and crew of the show were forced to flee the country after being attacked with stones by protesters.
A BBC spokesman said: "We're pleased the team is safe and would like to thank all of those who have helped. As the executive producer has made clear, the number plate issue is a very unfortunate coincidence."
The executive producer of the motoring show, Andy Wilman, earlier said suggestions the number plate was chosen deliberately were "completely untrue".
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