Second pre-season F1 test
Runs from 08:00-17:00 GMT
Stoffel Vandoorne's McLaren stops twice on track
Red Bull also brings out the red flag
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Your Formula 1 theme tune
Kayleigh: Anyone who says ‘Just Drive’ needs to be banned from watching Formula One.
Mr Happy: Should use the intro music to f195 on the Playstation as the new theme!
Paul Sharman: F1 Theme Tune, Oh ...Man if it ain't broken Don't fix it.
Carlos Sainz is out for the first time this afternoon after taking over from Nico Hulkenberg, who finished the morning with a best time of 1:21.432.
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Lewis Hamilton leaps up to sixth with 1:21.341 on the softs. He's a second off Sebastian Vettel's benchmark but give it time.
Stoffel Vandoorne remains at the foot of the timesheet but he's on supersofts so should climb the order soon.
Your Formula 1 theme tune
Jim Robb: F1 theme song is Fleetwood Mac's The Chain. End of. No argument. Anything else is wrong.
Chris Marsh: BBC already have the best F1 theme tune. Fleetwood Mac - The Chain. Discussion over..
Rob: The formula 1 Theme should sound like "The Chain" and be performed by Fleetwood Mac
The people have spoken! To be fair, it is quite possibly the best theme tune to anything ever.
Lewis Hamilton is on softs and he starts his stint in the Mercedes with a 1:22.868.
Stoffel Vandoorne is back out on the track. So far so good for McLaren.
Stoffel Vandoorne pits after taking his lap tally up to 14 and out comes Lewis Hamilton for the first time this week.
Your Formula 1 theme tune
Somewhat interesting news over the weekend that Liberty Media has hired the man behind the music for films such as Fast and Furious, Avengers and Iron Man to come up with a theme tune for Formula 1.
With that in mind, what would your Formula 1 theme song be? What would it sound like and who would you get to compose/sing it?
Let us know via #bbcf1 or text in on 81111 (UK only)
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Dan Knutson
F1 journalist in Barcelona
Nice perks for the Red Bull brass and the drivers are the company cars.
Image source, .Sergio Perez has gone back in so it's just Stoffel Vandoorne out there making up for lost time. He remains bottom of the timesheet but has posted improvements with every lap, with his latest a 1:21.946.
Andrew Benson
BBC Sport’s chief F1 writer
Lewis Hamilton said that he found this winter particularly valuable in terms of recharging his batteries after a long and challenging 2017.
“It was recovery, because if you saw my schedule you would be super shocked that I do what I do with the schedule that I have, which I’ve partly created for myself but also my team. So it was really just recharging. I really needed to recharge and I had the best period - probably the longest period that I’d have for a long, long time. As long as I can remember to be honest. It was much-needed but also meant that I had extra time to prepare and get ready. I'm super fresh, I feel great. That’s a good thing.”
A change at Mercedes is due this afternoon with Lewis Hamilton set to take over from Valtteri Bottas, who did 86 laps this morning.
Sergio Perez also heads out.
Force India have had a pretty low key testing so far. They did the fewest amount of laps in the first test and only McLaren have done fewer than them today.
First on the tack? It's Stoffel Vandoorne in the McLaren.
Lunch over already?
The afternoon session is under way!
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#bbcf1 or text in on 81111 (UK only)
Probably Moaning: I know, completely different situation, but for all the McLaren critics: remember the mess Red Bull were in during 2013‘s pre-session tests? 107% outside the fastest time and 3rd least laps completed. McLaren won’t win the title this year - but don’t write them off
John Wilkinson: In F1 the adage is do the opposite of what Alonso would do. He wanted another engine supplier, McLaren should have stuck with Honda.
Image source, F1.comEncouraging signs so far from Toro Rosso. They are certainly getting some decent mileage out of the Honda engine - they completed the most laps in the first test and are up to 53 for today.
First test:
Toro Rosso 326
Mercedes 305
Ferrari 298
Sauber 284
Williams 277
Renault 273
McLaren 271
Red Bull 211
Haas 187
Force India 166
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Andrew Benson
BBC Sport’s chief F1 writer
McLaren had a dismal start to the final pre-season test when their car broke down after just four laps.
Stoffel Vandoorne suffered a battery problem, making it the third day in five in winter testing so far on which McLaren have had reliability problems.
Ferrari's Sebastian Vettel was fastest in the morning, ahead of Mercedes' Valtteri Bottas and Max Verstappen of Red Bull.
Vandoorne suffered the same problem - an electrical shutdown - twice. First the car cut out on its way into the pits, then after setting his first time, Vandoorne ground to a halt on the pit straight.
McLaren managed to get Vandoorne out again just before the chequered flag ended the morning session, giving him a total of seven laps, while Vettel, Bottas and Verstappen all did more than 80.
Meanwhile, Honda's new partner Toro Rosso - the Red Bull junior team - managed more than 50 laps and their driver Pierre Gasly was just 0.377secs off the pace on Tuesday morning.
1) Vettel, Bottas 86
2) Verstappen 85
3) Ericsson 56
4) Gasly 53
5) Hulkenberg 48
6) Magnussen 46
7) Sirotkin 42
8) Perez 37
9) Vandoorne 7