 Mercedes topped the time sheets in the second session , now switching to the soft compound tyres as well , with Nico Rosberg two and a half @-@ tenths of a second clear of Kimi Räikkönen , while Lewis Hamilton was third fastest , more than seven tenths off Rosberg 's time . Räikkönen 's running was interrupted for a while when he was called back into the <unk> to investigate a fuel system problem , but was able to get back out . Fernando Alonso was seventh fastest for McLaren , but needed a replacement of his car 's plank after running wide over artificial grass surrounding the track . His teammate , Jenson Button , also experienced problems , having to stop at the end of the <unk> early in the session with an electrical issue . Renault 's problem from the first session continued : Jolyon Palmer , back in his car in place of <unk> , suffered a tyre failure on the start @-@ finish straight , bringing out red flags in the process . Renault and tyre supplier Pirelli were left puzzled over the failure , as in this incident , no sign of a cut from debris was found . 
