Andrea Kimi Antonelli's car suddenly stopped in the final laps of the Barcelona-Catalunya Grand Prix, resulting in a loss of 18 points for Mercedes.
The team's second engine failure in three events has raised concerns about reliability, with Mercedes boss Toto Wolff stating that "nobody is happy about that".
What happened?
Andrea Kimi Antonelli's engine failure was the latest in a series of related problems for Mercedes, with George Russell's retirement from the Canadian Grand Prix being a similar issue.
The problem appeared to be electrical, with the car switching itself off, and Wolff noted that "we can't DNF cars in a kind of regular or continued way".
Why it matters for Andrea Kimi Antonelli
The engine failure has significant implications for Andrea Kimi Antonelli's championship chances, as Ferrari is now threatening to insert itself into the championship battle.
Mercedes technical director James Allison stated that the problems "originate in the same broad part of the battery" and that the team needs to "get on top of" reliability.
Andrea Kimi Antonelli's stoppage was the seventh weekend of the year, and the team is still trying to understand the cause of the problem.
What comes next?
Mercedes will be "digging deep" to solve the problem, with Allison noting that "with a bit of luck, when we start to sort of phase in the new modules into the racing season — we call the battery 'the module' — then our fortunes as a fleet should pick up".
The team is also waiting for the damaged battery from Russell's car to arrive from Montreal, which is expected to take several months due to airline safety regulations.
Andrea Kimi Antonelli's engine failure has cost Mercedes 25 points in the constructors championship, and the team is under pressure to solve the problem quickly.
The Barcelona-Catalunya Grand Prix was the seventh weekend of the 2026 FIA Formula One World Championship, and Andrea Kimi Antonelli's engine failure has raised concerns about the team's ability to finish the season strongly.