After his Formula One career, Yoong initially struggled to remain visible in international motorsports. Soon after leaving Formula One, Yoong claimed that he was owed $200,000 in salary and that Paul Stoddart was threatening legal action against Yoong's sponsors for $1.5 million that was allegedly promised. Yoong later stated the deals were not related to his salary.
Champ Car in 2003. Yoong went into
Champ Car to join Dale Coyne racing to partner
Joel Camathias after
Roberto González left due to a lack of sponsorship. His debut race at Mexico saw Yoong qualify 17th and finished ninth. Yoong was signed on a contract for the remainder of the season was signed after an impressive test session at the Arizona Motorsports Park gave the opportunity for more sponsorship to come forward. Despite this, Yoong qualified last at Long Beach and became the first retirement. At
Brands Hatch, he qualified 13th but spun out. At the
Lausitzring, Yoong again qualified in 13th and mechanical problems struck him before half-distance. By the end of May, sponsorship funding was not being received, forcing Yoong to leave Champ Car.
Porsche Carrera Cup Asia Yoong found a drive in the
Porsche Carrera Cup Asia after being invited to drive a guest car in a round supporting the Macau Formula Three Grand Prix. Driving a 2002-spec car, he overcame several brushes with the wall to qualify 3rd and swept past
Charles Kwan and pole-sitter
Matthew Marsh at the start of the race. Despite a gearbox issue, Yoong won the race by 1.186 seconds. Yoong joined
WPS Racing for the endurance races. Pairing up with New Zealand rookie
John McIntyre, the entry struggled to 21st place in the
2004 Betta Electrical Sandown 500 having found themselves in the muddy run-off areas on multiple occasions – a fate also suffered by the team's second
Ford Falcon BA. McIntyre was moved to said other car for the
Bathurst 1000, leaving Yoong to partner with Neil McFadyen. In the only start at the
Mount Panorama Circuit for the pair of them, they kept out of trouble and finished two laps down in 15th. Yoong was retained by Craig Gore's team for the single-driver event on the
Gold Coast, where he retired from the first race and finished 23rd in the second. Yoong was replaced with
Owen Kelly for the remaining rounds of the championship.
A1 Grand Prix ;2005–06 Yoong won three races: two sprint races and one feature race. Yoong drove for
A1 Team Malaysia in the
A1 Grand Prix series. The series is widely regarded as rejuvenating Yoong's career and reputation. He became the lead driver and put together an outfit of primary Malaysian crew members, an example followed by other National teams. Amongst the non-Malaysians was team principal Jack Cunninghan and chief engineer Greg Wheeler. The first test session at Brands Hatch saw Yoong set the third fastest time behind France and Brazil and the second test had brought in GP2 Driver
Fairuz Fauzy. In the inaugural race at Brands Hatch saw Yoong qualify 9th and finished 5th in the feature race after Fauzy drove in the sprint race. At the Lausitzring, Yoong started in 18th and charged up to seventh by the end of the first lap and ended up in sixth. Yoong drove at
Eastern Creek to qualify ninth and finished eighth and fifth respectively. At his home race in Malaysia, Yoong repeated his results at Eastern Creek in Australia. At Monterrey, a tenth place on the grid followed by a seventh in the sprint race and 11th in the feature race. At the penultimate round at
Mazda Raceway Laguna Seca, Yoong qualified fourth and a sprint race that saw wet conditions led to him spinning off and having to start at the back for the feature race where he climbed to tenth and one point. whilst Yoong scored a podium in the feature race by finishing second. ;2006–07 The first round in Amsterdam saw Yoong collide with a stalled car before the warm-up lap but set the fastest lap and finished 17th and earlier ended up 12th in the sprint race. The race at Brno, became Yoong's best results winning in both the sprint and feature races. In Australia, Yoong finished seventh and sixth, respectively. At the Round in Mexico, Yoong started from pole and gave Malaysia their third win of 2006–07 in the sprint race at the Autodromo Hermandos Rodriguez Circuit. Yoong received the Bruce McLaren trophy on 28 April 2007 for his strong performance in the 2006–07 A1GP season ;2007–08 For 2007–08, Yoong was announced to remain with Malaysia and was partnered alongside Aaron Lim. At Zandvoort, Yoong qualified 20th for both races. Yoong suffered from four consecutive retirements from the races in Zhuhai and New Zealand. He did not attend the races at Australia and South Africa, bringing an end to starting 45 successive races. The decision came from the team electing to run
Fairuz Fauzy. In Shanghai, Yoong started from 6th in the Sprint race and managed to climb up to fourth where he finished and scored sixth in the sprint race.
Le Mans Series After the 2005–06 A1 Grand Prix season, Yoong raced in the 2006
Le Mans Series as well as the 2006 Le Mans 24 Hrs for
Jan Lammers, the
A1 Team Netherlands seat holder with team
Racing For Holland. Yoong was very competitive, holding the third position in Lammers' Dome-Judd when the throttle stuck, sending the car into the wall at the first chicane on the
Mulsanne Straight and breaking both steering arms. In the race at Istanbul, Yoong set the fastest lap 90 minutes into the race and retired after the starter motor failed during a pit stop. Lammers and Yoong elected not to attend the Spa 1000 km event after the team decided to change the engine from a
Mugen to a
Judd. After the 2006–07 A1 Grand Prix season, Yoong once again returned to the
Le Mans Series with
Charouz Racing System. He teamed up with
Jan Charouz of the Czech Republic and
Stefan Mucke of Germany. The team entered the most famous of endurance races, the
24 Heures du Mans and the
Le Mans Series. In the
2007 24 Hours of Le Mans, the team completed 338 laps and finished in eighth overall and fifth in LMP1 Class.
GP2 Asia Series For the
2008–09 GP2 Asia Series season, Yoong signed to drive for the
Qi-Meritus Mahara team. He was replaced by
Marco Bonanomi for the third race weekend in
Bahrain, due to a lack of sufficient time for racing.
Lotus Young Driver Programme Lotus Racing announced on 9 December 2009 that Yoong would become the leader of their young driver development programme. Yoong currently focuses on the development of drivers in Asia.
Intercontinental Le Mans Cup (left) and
Matthew Marsh (right) after winning the GTC class of the
2010 1000 km of Zhuhai. In November 2010, Yoong partnered
Marchy Lee and
Matthew Marsh at the
1000km Zhuhai race, driving an
Audi R8 LMS. The trio won the GTC class.
2011 SEA Games Yoong has earlier competed for the
water skiing event in the
1997 Jakarta Games where he won a silver medal. He returned to
Water skiing at the 2011 Southeast Asian Games and he claimed one gold medal and one silver medal in the men's slalom and jump events on 17 November 2011. Yoong was a representative for Malaysia in the 1992 Junior World Waterski Championships held in Colombia, before he concentrated on his motorsport career.
Audi R8 LMS Cup Yoong is currently a driver in the
Audi R8 LMS Cup with Audi TEDA. In the inaugural race in Shanghai, Yoong started second on the grid. At the start, he overtook rival Marchy Lee at the first corner and won the race. In the second race, Yoong finished second behind
Adderly Fong. The third round in Zhuhai, saw Yoong qualified on pole and during the race, he lost the lead as Lee overtook the Malaysian and Yoong was third at the end of lap one and in front a four-car battle that took place behind him. He eventually finished on the final podium position in third. During the fourth round, he finished third after an overtaking manoeuvre with Lee resulted in Yoong taking damage to his car. ==Personal life==