Christian Lundgaard ended the second day of testing from Valencia with the fastest time, as he did on Sunday.
Lundgaard's fastest lap time of a 1:20.860 was set in the morning session and was one and a half tenths quicker than Lorenzo Colombo.
Despite his pace in the afternoon session, Piastri was hit with issues in the morning and caused a red flag after stopping his car at Turn 6.
David Beckmann's time put him fourth place , while Seastian Fernandez was fifth, only 0.024s behind Beckmann.
Lundqvist's session ended in disappointment as his car was left stranded on the circuit with an issue, bringing out a red flag.
At the same time, Joao Viera's car also ran into issues, meaning he also had to be recovered late on into the session.
Testing from Valencia concludes on Tuesday, where drivers will be looking to gain more experience and knowledge with the cars.
Bahrain International Circuit - Winter testing