Having left Ferrari at the end of the 2018 Formula One season, Kimi Raikkonen's first session back with Sauber ended with smoke seemingly coming from his car.
Seventeen years on from his debut F1 campaign at Sauber, the Finn has returned after two spells with the Prancing Horse, the first of which included a world title triumph in 2007.
In testing in Abu Dhabi on Tuesday, two days after the conclusion of the season, Raikkonen's initially productive outing endured a premature ending.
Having completed 102 laps, Raikkonen was forced to stop at Turn 7 and called on the assistance of a nearby steward and a fire extinguisher after what looked to be smoke appeared to be coming from the back of his C37.
"In the final run, the team finished just a few minutes ahead of schedule, without compromising the test programme. The causes are still under investigation," read a Sauber statement.
The Finn was 11th fastest of the dozen drivers to take to the track, over three seconds behind the leading pace of his former Ferrari team-mate Sebastian Vettel, who posted the fastest time despite a spin and damage to his rear wing.
Lando Norris debuted for McLaren, as did Williams pair George Russell and Robert Kubica - the latter back in the sport after an eight-year absence, having suffered life-altering injuries in a rally crash in 2011.
Lance Stroll drove for Racing Point Force India, despite not yet being confirmed as having a seat for 2019, as teams tested out the new Pirelli tyres at Yas Marina Circuit.
"The purpose of this test is primarily to get a first feeling of the new tyres, with the impressions of the last weekend of racing still fresh in our minds, which gave us the possibility to compare," said Vettel.
"Unfortunately, today we lost some track time to repair work, but overall I think there were no major surprises as these tyres seem to work and to be fairly similar to the ones we used this season.
"Now we'll see how the new regulations for 2019 affect the speed of all cars and how they work in combination with the tyres, also depending on the compound choices at the various tracks."
|Klopp: I cannot keep every Liverpool player happy|
|Messi and Suarez outscoring Real Madrid and Atletico in LaLiga|
|Levante 0 Barcelona 5: Marvellous Messi banishes ghosts of last season|
|Colts rout Cowboys to keep playoff hopes alive|
|Bears shake off Packers to win NFC North and return to playoffs|
|Mourinho explains Pogba omission and defends Lukaku´s Liverpool showing|
|Liverpool´s display against Manchester United one of the best, claims Klopp|
|Look away Jose! Damning stats expose Manchester United´s limp Liverpool loss|
|Time´s up, Mourinho: Manchester United can dither no longer|
|Manchester United´s players are not dishonest – Mourinho|
|Manchester United´s lack of ambition under Mourinho is scary – Keane|
|Mourinho: All Manchester United can achieve is fourth|
|Quagliarella should be protected by UNESCO, jokes Sampdoria coach|
|Manchester United surpass last season´s goals-against tally in first 17 games|
|Hasenhuttl revels in ´unbelievable´ victory over Arsenal|
|Liverpool 3 Manchester United 1: Shaqiri´s late show bails out Alisson as Reds return to the top|
|Edinburgh in control in Champions Cup, Racing win again|
|Emery ponders January signing after Bellerin injury|
|It is only a knock – Sarri plays down Hazard injury fears|
|Redskins QB Alex Smith released from hospital|
|Starc: If I listen to Warne, I may as well retire|
|Curry interviews retired NASA astronaut, apologises for moon comments|
|Hazard refusing to give up on Premier League title hopes|
|Ziyech & Blind score hat-tricks as Ajax claim 8-0 win|
|Canelo v Fielding: What next for three-weight champion Alvarez?|
|Southampton 3 Arsenal 2: Austin and Ings end Gunners´ long unbeaten run|
|Brighton and Hove Albion 1 Chelsea 2: Sensational Hazard proves the difference|
|Pogba on the bench as Clyne starts for Liverpool|
|Lipsky ends long barren spell in Malelane|
|Lakers´ Stephenson to repeat air guitar despite technical|
|Fletcher pushed Miller on to Broncos sack record|
|The Sarri effect: Hazard surpasses 2017-18 goal involvements in just 16 games|
|Van der Burgh retires on a high note with breaststroke double|
|Rashford: Liverpool was never an option|
|No team Liverpool play this season will be as motivated as Man United – Klopp|
|India surprised by contentious Kohli decision - Bumrah|
|The Sunday Seven - 7 Key Opta facts for NFL Week 15|
|Miller eyeing Joshua bout at Madison Square Garden|
|Finch cleared of serious damage after another finger blow|
|Rashford ´untouchable´ because he plays on his limits – Mourinho|
|It´s important to have his mentality - Mayfield thrilled with Kobe Bryant visit as Browns beat Bronc|
|Centurion Latham indebted to ´world-class´ Williamson|
|Spurs´ Dier out until January after appendix removal|
|A-League Review: Glory down Jets to stay unbeaten|
|Philander ruled out of first Test|
|Controversial Kohli dismissal puts Australia in command|
|Thunder´s Westbrook: ´When we defend like that — best team in the league´|
|Kante at his best further forward, reiterates Sarri|
|Rose capitulates in Indonesia to squander chance to top rankings|
|Fielding: The better man won but I lived a dream|
|Rallying Bulls stun Spurs, LeBron and Ball post triple-doubles|
|Latham century puts New Zealand in commanding position|
|Mayfield leads Browns past Broncos|
|Canelo-GGG trilogy? We can make it happen – Alvarez|
|Canelo outclasses Fielding by third-round TKO|
|Farmer retains title prior to Canelo-Fielding bout|
|Qatar unveils Lusail Stadium for 2022 World Cup|
|Lakers pair LeBron, Ball revel in triple-double feat|
|Allegri hails ´great professional´ Ronaldo|
|LeBron, Ball first Lakers team-mates with triple-doubles in same game since 1982|
|Premier League contenders Liverpool ready to win titles – Henderson|
|Hopkins´ two TDs help Texans close in on AFC South title with win over Jets|
|Courtois: Simeone criticises Real Madrid to boost popularity|
|Mourinho in the dark over transfers as Pogba rumours swirl again|
|Mourinho marvels at Salah going nuclear|
|The lucky ones - Mourinho assesses Liverpool´s title charge|
|Juventus boss Allegri turned his back on Ronaldo penalty|
|Dickerson hoping Barkley falls short of breaking his records|
|Bristol shock La Rochelle, Clermont win again|
|LeBron: Meeting Jordan for first time was godly|