Lewis Hamilton cruised to pole position for the Italian Grand Prix, his 11th of 2015, while Ferrari claimed second and third on the grid.
Hamilton posted a 1:23.397 on his first lap in Q3 which was ultimately not beaten, as Kimi Räikkönen claimed a front-row start at the expense of team-mate Sebastian Vettel.
Vettel held second after the first runs but didn't improve on his next lap, enabling Räikkönen to move ahead.
Mercedes detected an undiagnosed problem on Nico Rosberg’s engine before qualifying and the squad was forced to revert back to an old unit.
That left Rosberg at a disadvantage and he could manage only fourth, though was less than a tenth behind Räikkönen.
Williams will lock out the third row of the grid as Felipe Massa and Valtteri Bottas claimed fifth and sixth, while Sergio Pérez was seventh for Force India.
Romain Grosjean took eighth, with Nico Hülkenberg suffering a loss of power after his first lap in Q3 and finishing ninth.
Marcus Ericsson made it through to Q3 but is being investigated by the stewards after allegedly impeding Hülkenberg during the first knockout phase.
Pastor Maldonado was the sole Mercedes-powered driver unable to make it into Q3 after posting the 11th best time, while Felipe Nasr suffered a lock-up at the Roggia chicane on his way to 12th.
Carlos Sainz Jr. was 13th for Toro Rosso, while both Red Bulls were knocked out of Q2, as Daniil Kvyat was 14th and Daniel Ricciardo did not run in the session.
Neither McLaren driver made it through to Q2 as Jenson Button collected 16th, with Fernando Alonso in 17th place.
Manor Marussia took 18th and 19th as Will Stevens beat Roberto Merhi by 0.2s and due to the penalties of others the pair are set to move higher up the grid.
Max Verstappen only joined the action towards the end of Q1 following work on his Toro Rosso and when he did so bodywork from his engine cover detached itself as he rounded Curva Grande, leaving him without a time.