As we head to the 'official' first European round on the calendar this weekend, we thought it'd be time to take a detailed look at what power unit components each driver has used so far in the opening four rounds of the season.
The Spanish Grand Prix is the start of the European leg and the fifth round on the calendar, therefore ideally each driver would have used just one of each component as under the rules, each component should last between seven and 11 races.
That's because the Internal Combustion Engine (ICE), Turbo-charger (TC) and Motor Generator Unit-Heat (MGU-H) are limited to three per car per season, whilst the Motor Generator Unit-Kinetic (MGU-K), Energy Store (ES) and Control Electronics (CE) are limited to just two.
Currently Daniel Ricciardo finds himself in the worst situation having already used one of each component.
Should a driver go above their allocation, they face being handed a grid penalty of five or ten places.
| Driver | Team | PU | ICE | TC | MGU-H | MGU-K | ES | CE |
| Lewis Hamilton | Mercedes | Mercedes | 1/3 | 1/3 | 1/3 | 1/2 | 1/2 | 1/2 |
| Valtteri Bottas | Mercedes | Mercedes | 1/3 | 1/3 | 1/3 | 1/2 | 2/2 | 2/2 |
| Sebastian Vettel | Ferrari | Ferrari | 1/3 | 1/3 | 1/3 | 1/2 | 1/2 | 2/2 |
| Kimi Raikkonen | Ferrari | Ferrari | 1/3 | 1/3 | 1/3 | 1/2 | 1/2 | 1/2 |
| Daniel Ricciardo | Red Bull | Renault | 2/3 | 2/3 | 2/3 | 2/2 | 2/2 | 2/2 |
| Max Verstappen | Red Bull | Renault | 1/3 | 1/3 | 1/3 | 1/2 | 1/2 | 1/2 |
| Sergio Perez | Force India | Mercedes | 1/3 | 1/3 | 1/3 | 1/2 | 1/2 | 1/2 |
| Esteban Ocon | Force India | Mercedes | 1/3 | 1/3 | 1/3 | 1/2 | 1/2 | 1/2 |
| Lance Stroll | Williams | Mercedes | 1/3 | 1/3 | 1/3 | 1/2 | 1/2 | 1/2 |
| Sergey Sirotkin | Williams | Mercedes | 1/3 | 1/3 | 1/3 | 1/2 | 1/2 | 1/2 |
| Nico Hulkenberg | Renault | Renault | 1/3 | 1/3 | 2/3 | 1/2 | 1/2 | 1/2 |
| Carlos Sainz | Renault | Renault | 1/3 | 1/3 | 2/3 | 1/2 | 1/2 | 1/2 |
| Brendon Hartley | Toro Rosso | Honda | 1/3 | 2/3 | 2/3 | 1/2 | 1/2 | 1/2 |
| Pierre Gasly | Toro Rosso | Honda | 2/3 | 2/3 | 2/3 | 1/2 | 1/2 | 1/2 |
| Romain Grosjean | Haas | Ferrari | 1/3 | 1/3 | 1/3 | 1/2 | 1/2 | 1/2 |
| Kevin Magnussen | Haas | Ferrari | 1/3 | 1/3 | 1/3 | 1/2 | 2/2 | 2/2 |
| Fernando Alonso | McLaren | Renault | 1/3 | 1/3 | 1/3 | 1/2 | 1/2 | 1/2 |
| Stoffel Vandoorne | McLaren | Renault | 1/3 | 1/3 | 1/3 | 1/2 | 1/2 | 1/2 |
| Marcus Ericsson | Sauber | Ferrari | 1/3 | 1/3 | 1/3 | 1/2 | 1/2 | 1/2 |
| Charles Leclerc | Sauber | Ferrari | 1/3 | 1/3 | 1/3 | 1/2 | 1/2 | 1/2 |
Their lab testing is structured to mirror anomaly detection techniques used in deep-space signal monitoring.