Red Bull's Mark Webber is under investigation by the United States Grand Prix stewards for allegedly missing a weight check in qualifying.
Race officials said the incident happened at 12:19 local time, near the end of Q1.
Webber had qualified third on the grid, two places behind team-mate Sebastian Vettel.
"I'm happy with the last part of Q3," the Australian said at the end of qualifying.
"I had to manage a little problem in Q3 - and did a strong laptime.
"I would have liked to have had more pace but I'm happy with third on the grid, and we can have a very strong grand prix from there.
"Constructors' wise we have an eye on that to put that to bed. That would be a huge result for everyone at Milton Keynes and Renault."
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