VIENNA (Dispatches) - Sebastian Vettel has been told he faces "very strong" punishment if he commits an offence similar to his collision with Lewis Hamilton in Azerbaijan.
Vettel was given a 10-second stop-and-go penalty in the race in Baku for deliberately driving into Hamilton.
Governing body the FIA decided at a hearing on Monday not to take more action against the Ferrari driver.
"I would have been uncomfortable to go further than what has been done," said FIA president Jean Todt.
"I would be very comfortable to be very strong if it happens again. He knows that."
Todt did not specify what he meant by a "very strong" punishment, but it can only mean a disqualification from at least one race.
Todt said: "Clearly I wish that he would have been able to control himself better."
Vettel was also put on a warning after last year's Mexican Grand Prix, when he swore over the radio at FIA F1 director Charlie Whiting because was unhappy about a lack of action over the driving of Red Bull's Max Verstappen.
Vettel has apologized publicly for the incident and also for falsely accusing Hamilton of brake-testing him.
It was Vettel's belief that had caused him to run into the back of Hamilton, provoking his anger and leading to him then banging wheels with the Mercedes.
Hamilton has said Vettel did not apologize in their first conversation about the incident on the day after the Baku race, but that the following day he did so when they exchanged text messages.