Formula 1 teams are considering next steps after some were left "shocked" and "angry" by the conclusion to last year's Ferrari engine controversy.
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They are concerned that the FIA's attempt to draw a line under the matter does not make it clear whether Ferrari's engine was legal at all times last year or not.
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The FIA clarification was issued on the morning of qualifying in Austin, and later that day a run of six consecutive Ferrari pole positions came to an end. The team did not set a pole position in any of the remaining two races in Brazil and Abu Dhabi either.
Ferrari team principal
Mattia Binotto said the two matters were not related, and that apparent differences in the car's straight-line performance seen by rivals were caused by the team changing the way they ran it and adding more downforce and therefore drag.