McLaren arrived in Shanghai with championship ambitions and left with what one pundit branded the most embarrassing weekend of their season so far. Both works cars failed to take the start of the Chinese Grand Prix, an unprecedented double DNS that has put the spotlight squarely on the team's relationship with its Mercedes power unit supplier.
The scale of the failure was not lost on F1 commentator TacticalRab, who reviewed the wreckage on his post-race breakdown.
"It is embarrassing, right? I mean, like, they got double disqualified in Vegas last year. That was bad. But double DNS is outrageous, especially with separate issues."
That last detail is the one paddock engineers keep returning to. A single component failure across both cars would point to a bad batch of parts. Two different problems, on two different sides of the garage, on the same morning, pulled a much harder question into the open: is something fundamental wrong with how the MCL40 is integrating its Mercedes-supplied hardware?
Lando Norris, speaking after the race, gave the most candid public hint yet at where McLaren are looking.
"Oscar had another issue that wasn't his — like, it wasn't the same issue. It was a different issue, but potentially also related to some sort of software integration thing with the power unit from Mercedes."
It is a careful answer, but a revealing one. Norris was not blaming his team-mate, and he was not blaming Mercedes outright. He was instead pointing at the seam where McLaren's chassis software talks to the Brixworth-built power unit — the kind of interface problem that 2026's complex new power units have made dramatically harder to manage.
The context magnifies the damage. McLaren are racing Mercedes for the constructors' title in 2026, and both teams now run effectively the same engine. Anything that paints the Brixworth unit as fragile is, in the championship maths, a potential anchor on McLaren's season. Anything that paints McLaren's integration as worse than the works Mercedes team is arguably more painful.
In that light, Sunday in Shanghai stings twice. Mercedes' two cars not only finished — they were on the front row in qualifying, won the sprint with Russell, and finished the main race with both drivers on the podium. McLaren's two cars never made the formation lap. The contrast was as brutal as F1 contrasts come.
Norris's broader assessment of the weekend confirmed the picture. McLaren had over-performed in Saturday's sprint, he conceded, and the gap to Ferrari on race pace had been bigger than the timing screens suggested.
"Yesterday showed we kind of overachieved, because our pace to the Ferrari was just nowhere near quick enough today. So just not the pace in the car at the minute to race the guys ahead."
For a team that started the year talking about a title fight, the admission lands hard. The double DNS will get the headlines and the memes. But the worry inside the McLaren factory will be the deeper one Norris quietly flagged on the way out of Shanghai — that the gap is not just operational, but baked in somewhere between the chassis floor and the Mercedes engine map. Until the 'software integration thing' is identified and fixed, McLaren's 2026 title hopes risk being decided as much in a Brixworth dyno cell as on track.
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*Originally published on [News Formula One](https://newsformula.one/article/mclaren-shanghai-double-dns-norris-mercedes-power-unit-software). Visit for full coverage.*
