Double trouble for Sainz: How sensor damage led to two pit lane penalties in Mexico Grand Prix mayhem

 

On lap one, Carlos Sainz collided with Liam Lawson at turn one while avoiding a chain reaction involving Esteban Ocon and Fernando Alonso. The contact damaged Sainz’s front wheel rim and critical speed sensors which are essential for regulating the pit lane speed limiter. Lawson was forced to retire shortly after due to damage, later accusing Sainz of reckless driving, saying: “I left plenty of space and he just cut the chicane.”

The damaged sensors disrupted Williams’ ability to accurately control pit lane speed, leading to two fractions. Sainz exceeded the limit by 0.2 km/h resulting in a five second time penalty. He exceeded the limit by 9.8 km/h triggering a drive through penalty. Williams Team Principal James Vowles explained that the vibrations from the rim damage forced an early stop and compromised the limiter system: “The race was over after turn one … the damage resulted in both a flat spot and sensor failure.”

The FIA issued graduated penalties based on the severity of the speed excess. The repeat nature of the breach. While the first infraction was marginal, the second was deemed significantly over the limit, justifying the harsher drive through penalty.

Vowles, Team Principal of Williams, confirmed that damage to Sainz’s wheel rim and speed sensors sustained during the contact with Lawson at turn one was the direct cause of the pit lane speeding infractions. The sensor failure compromised the pit limiter system leading to two separate breaches. Vowles described the situation as “unfortunate but clear,” emphasising that the team had no way to recalibrate the limiter mid race.

Sainz expressed disappointment post race, calling the penalties “disproportionate” given the unavoidable nature of the damage. He argued that the FIA should have considered the context of the failure, stating: “I was penalised twice for something I couldn’t control.” The Spaniard’s frustration was compounded by the fact that Lawson retired from the same incident, while Sainz’s race was effectively ruined by cascading technical issues.

The FIA cited Article 36.5 of the Sporting Regulations which allows for multiple penalties for repeated infringements, especially when safety is at stake such as exceeding pit lane speed limits. While rare, the stewards emphasises that the second infraction involved a significantly higher speed and occurred after the team has been warned justifying the escalation from a time penalty to a drive through. The incident has reignited discussions about whether technical failures caused by race contact should be treated differently under the rules.

📸 Imagery courtesy of Atlassian Williams Racing