Ayrton Senna's Personal Honda NSX Heads to Auction, and Its Backstory Runs Deeper Than the Hosepipe PhotoChassis JHMNA11500T000233 doesn't look like much on a title certificate, but this is the actual red Honda NSX that Ayrton Senna washed with a garden hose in his driveway, dumped the clutch in for a documentary crew, and drove to a podium finish near his own front door. RM Sotheby's is putting it up for bid at The London Auction on October 31, 2026, with a pre-sale estimate of £500,000 to £800,000, and the paperwork behind it is more interesting than the price tag.Honda didn't sell Senna this car. At the start of 1991, with two Formula 1 titles already banked and a third campaign underway, Senna had an arrangement with Honda Motor Company that put three NSXs at his disposal for personal use in Europe. Two were black. This one, chassis T000233, was finished in Formula Red over a black leather interior, imported by Honda Automobil de Portugal, and registered on March 22, 1991, with the plate SX-25-59. It lived in Lisbon and was delivered to Senna whenever he flew in, mostly so he could get around near the Quinta do Lago property he owned in the Algarve.That access produced two of the most reproduced images of Senna outside a cockpit. One is the shot of him in jeans and a button-down shirt hosing down the NSX outside his house. The other is a scene in the 1992 documentary Ayrton Senna: Racing Is in My Blood, where he lights up the rear tires dumping the clutch in the driveway. He also used the car to commute to the 1991 Portuguese Grand Prix at Estoril, a weekend he'd qualify third and finish second.AdvertisementAdvertisementThe NSX's connection to Senna runs earlier and deeper than chauffeur duty, though. Honda brought him in during prototype testing in February 1989 at Suzuka, before the car even had its name, and asked for his read on the chassis. His now well-documented verdict, delivered with the caveat that he wasn't sure he could properly evaluate a production car, was that it felt "a little fragile." Honda's engineers took the note seriously enough to send a development team to the Nurburgring for a dedicated, months-long test program, and by the time they finished retuning the structure that spring, they'd increased body rigidity by 50 percent over the pre-Nurburgring figure. That work landed on a car that was already breaking ground as the world's first mass-production vehicle with an all-aluminum monocoque body, a structure that shaved roughly 140 kilograms off the body alone and nearly 200 kilograms off the finished car versus an equivalent steel design. None of that shows up in an auction photo, but it's the reason the NSX still gets cross-shopped against Ferraris and Porsches from the same era instead of being remembered as just a well-connected Honda.Senna died at Imola in May 1994. Ten months later, Lisbon's Automobile Registry Office recorded the car changing hands to a firm called Laboa Etablissement. Honda's own dealership network, through Nipomotor, had custody of it by September 1997. A Faro-based dealer, MSCAR Comercio de Automoveis, bought it in November 2009, and Robert McFagan acquired it in 2013, shipping the car to the UK and registering it for road use in 2016. In 2019, it made a symbolic trip back to Imola for the 25th anniversary of Senna's death, with former Minardi F1 boss Giancarlo Minardi driving demonstration laps. The car then returned to Japan when a Nagoya-based owner bought it in 2024, and it's that owner consigning it now, back in the UK, for RM Sotheby's sale.Anyone actually chasing this lot should read past the estimate. RM Sotheby's addendum notes the car entered the UK on a temporary import bond, meaning whoever wins it either has to re-export the NSX out of the country on an approved bill of lading or settle UK VAT and import duty before it can stay. That's a real cost variable on top of the hammer price and buyer's premium, and a good reminder that cross-border collector car deals carry paperwork most people never think about with a regular used car purchase.Provenance like this doesn't move in a vacuum. Honda has leaned hard into its motorsport archive this year, hauling more than 20 championship-winning race cars to Monterey, and the broader collector market just proved it will pay a premium for the right story, with this year's Monterey auctions combining for $636 million in sales. A Senna-owned road car checks boxes that no amount of restoration or low mileage can replicate: real racing-driver use, a documented paper trail, and a name that still sells cars decades later, including the modern McLaren Senna that shows up parked next to Ferraris and Bugattis in celebrity garages today. Whether T000233 sells at the low end of its estimate or blows past it on October 31, the final number will say less about the NSX than about how much the market still values the man who drove it.