What happened: Aston Martin retired both cars from the Mexico City Grand Prix after detecting abnormal pressure levels within the power unit systems. The team ordered both machines to stop to prevent catastrophic internal damage. The double retirement ended the squad's running early at Autodromo Hermanos Rodriguez.

Why it matters: A double power unit failure deals a significant blow to the team's standing in the constructors' championship battle. High-altitude conditions in Mexico City frequently place extreme thermal strain on internal engine components, exposing systemic cooling vulnerabilities. The unexpected retirements also raise potential grid penalty concerns if components require replacement ahead of upcoming rounds.

What to watch: Engineers will inspect both power unit packages to isolate the root cause of the pressure spikes before the next race weekend.