Harris, 46, was driving near Tintern in Monmouthshire, Wales, when he crashed with a pick-up truck performing a three-point turn.
The Porsche was embedded in the side of the truck between the front and back wheels – but Harris was unhurt.
He was working ahead of the 26th series of Top Gear – its last with Matt LeBlanc, which will air in early 2019.
Harris was driving on the A466 through the Wye Valley, with a senior executive from the magazine also in the car at the time of the crash.
An eyewitness said the pick-up truck was manoeuvring in an apparent three-point-turn before the collision.
Both vehicles were damaged in the crash – but both drivers were unhurt.
Harris has presented Top Gear since 2016, when he was brought as part of the team which replaced Jeremy Clarkson, Richard Hammond and James May.
A spokesman for BBC Top Gear said: "We can confirm that Chris Harris was involved in a car accident in Wales earlier today whilst working on a feature for Top Gear magazine.
"Chris, his passenger, and the driver of the other car, were unhurt. Police were called to the scene."
Harris has presented Top Gear since 2016, when he was brought as part of the team which replaced Jeremy Clarkson, Richard Hammond and James May.
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