Fernando Alonso wants no repeat of the unreliability that hit his car in practice in China and Turkey.
Red Bull say they did not break testing rules when Neel Jani drove the RB7 in Spain on Sunday.
McLaren say the FIA’s plan to restrict the use of exhaust gases would affect most teams.
Can F1’s new rules package provide excitement in Barcelona?
In the round-up: the FIA is to restrict how teams use their exhaust-blown diffusers.