For the BMW WilliamsF1 team the third practice session for the Italian Grand Prix would start with the announcement  WilliamsF1 test driver Antonio Pizzonia would replace Nick Heidfeld for the remainder of the Italian Grand Prix weekend. Heidfeld had been involved in a heavy crash in the testing leading up to this weekends race. He made it known to team officials that he was feeling unwell after yesterdays practice. This is a repeat of the testing crash involving Ralf Schumacher which saw Ralf withdraw from the Italian Grand Prix back in 2003 . By the end of the session Mark was in sixth and Antonio was in thirteenth.

With the start of the third practice session at Monza we would see both Jordan's and the Minardi's of Doornbos and Albers take to the circuit. Montoya was also out joined by team-mate Raikkonen. But with twenty minutes of the session run no driver had set a time.

Now we would have both the Renault's come out for their installation lap. It would be the Renault's who would set the first times of the session with Alonso setting a time of 1m:24.539 to be followed by Fisichella with a 1m:23.704. Giancarlo would go fastest with a time of 1m:22.900. The Jordan of Karthikeyan would be in third with a time of 1m:25.172. Ralf Schumacher was also out in his Toyota setting a time of 1m:25.470. Both Renaults had returned to their pits.

Ralf would move into third with a time of 1m:24.452. There was only fifteen minutes left in the session. Sato was now in fourth with a time of 1m:24.902. Barrichello and Villeneuve would start their flying laps. Sato was now in third with a time of 1m:24.352 while Jacques and Rubens were in sixth and seventh. Pizzonia was also out on his first laps for the WilliamsF1 team this weekend.

Rubens would improve to now be in fifth with a 1m:25.098. Pizzonia's first lap would see him set a time of 1m:33.274 to be in eighth. Villeneuve would move ahead of Rubens to claim fifth. Trulli was now in eighth with a 1m:25.343 pushing Antonio down one place. Antonio's next lap was a 1m:26.072 while Rubens was now in fourth with a 1m:24.029. mark Webber was also out while both Red Bull cars were on flying laps. Coulthard was now in ninth while Antonio was able to move into seventh with a 1m:24.627.

With five minutes remaining the order was Fisichella, Alonso, Sato, Barrichello, Trulli and on his first lap Mark Webber was in sixth with a 1m:24.255. Antonio was now in eighth. Klein was in thirteenth. Button was in tenth while Mark was able to improve to now be third with a time of 1m:23.162. Montoya was on a quick lap joined by Michael Schumacher. Montoya would move into third with a 1m:23.064 but Michael was able to go fastest with a 1m:22.728.

With the final minutes counting down Mark and Antonio were in sixth and
twelfth. At the front Raikkonen was able to go fastest with a 1m:22.694 but team-mate Montoya would snatch the quickest time off the Finn with a 1m:22.676. Alonso was back out and would move into fourth with a 1m:22.867. Kimi would beat Juan Pablo with a 1m:22.415 and Michael would push Montoya down one extra place when the Ferrari driver would go second fastest with a 1m:22.550.

So with the end of the session the order was Raikkonen, Michael Schumacher, Montoya, Alonso, Fisichella, Webber, Sato, Button, Ralf Schumacher, Barrichello, Coulthard, Trulli, Pizzonia, Klein, Massa, Villeneuve, Karthikeyan, Doornbos, and Albers.