The Finn was invited by the circuit to take part in a gathering of historic F1 cars to celebrate the 30th Japanese GP to be held at the venue.
Although he used the MP4-13 for demo runs later in his McLaren career, this was the first time that he had driven the car on a circuit since he retired from racing.
On Friday he just had a short shakedown run, and he is scheduled to drive again on Saturday or Sunday, although rain may have an impact on the plans.
He had one minor hiccup during the shakedown when he found that the pit entrance had changed since his last visit.
“You can imagine what it was like, particularly on this race track,” he told Motorsport.com. “It’s a fabulous race track, so many unbelievable memories, winning a world championship here against Michael Schumacher.
“Of course it feels like yesterday, it’s logical, because it’s such a strong memory.”
Hakkinen admitted that after so many years away the speed of an F1 car – even one from two decades ago – came as a shock to the system.
“The g-forces are so heavy, and you cannot compare it with a road car. What is amazing is that of course the car is so quick, all the common sense that you are thinking, is how is it possible that the cars can have such high performance?
“I feel that the engineers of the McLaren team, when they built that car for me, they did a brilliant team work.”
Asked if he ever thought he’d be driving an F1 car at 50, he said: “No! That’s a really good one. I could never imagine, but I tell you what, it’s good to be here.”
Mika Hakkinen, McLaren MP4-13 at Legends F1 30th Anniversary Lap Demonstration
Photo by: Mark Sutton / Sutton Images