changed Engine
One engine per race weekend
Changing an engine before the race meant a ten-place grid penalty; launch control and fully automatic gearboxes were banned again. Source
2 changes recorded for 2004. 2004 standings · results · ← 2003 · 2005 →
Changing an engine before the race meant a ten-place grid penalty; launch control and fully automatic gearboxes were banned again. Source
Both single-lap qualifying runs moved to Saturday, the second setting the grid. Source