Formula One's governing body will tonight rule on Red Bull's appeal against Daniel Ricciardo's exclusion from the Australian Grand Prix.
Ricciardo finished second on debut in his home race last month, but was disqualified hours later when stewards ruled his car had breached new fuel flow regulations.
The case is seen as a critical test of the regulations accompanying the V6 turbo engines and energy recovery systems, with Red Bull arguing the sensors can't be trusted, a version the FIA and other teams are disputing.
Red Bull have been using their own method of measurement, in breach of an FIA technical directive.
The barrister representing the Mercedes team as asked the judges to impose on Red Bull a further sanction, suspended until the end of the season to prevent them from breaching the rules again.