After the end of the season, Juan Cáceres, Roldán Rodríguez, Davide Rigon, Luca Filippi and Katherine Legge drove the PS05 during test sessions at Vallelunga.

Team owner Paul Stoddart and founder Gian Carlo Minardi both expected the PS05 to be fighting for positions with the Jordans.

[4] The carbon fibre chassis featured heavily sculpted sidepods and updated aerodynamics, which included innovative double plane winglets aimed at reducing drag and increasing downforce levels.

The PS05's first upgrade came in the Hungarian Grand Prix, when the team introduced a large vertical slit, a first as well and finishing off the year was a multi-profiled front wing.

Although both drivers complained about a lack of grip,[9] team owner Paul Stoddart believed the potential of the new car bodied "very well for the future.

At the United States Grand Prix, Albers and Friesacher finished one lap behind fourth place in a six-car race.

At the San Marino Grand Prix, both drivers retired within the first 20 laps of the race: Friesacher's car had a broken clutch shaft, while the no.

The PS05 retired due to gearbox-related issues again in Spain, while minor gearbox problems also happened in Monaco, Europe, Canada, United States, Great Britain, Turkey and China.

A broken oil pipe took Doornbos out of the Brazilian Grand Prix, while Albers suffered a sensor failure that compromised the performance of the differential and traction control system, affecting his pace in Interlagos.