O'Young began racing in 1988 at the age of eight, trained by his father. He progressed through karting to win both the Canadian National Championship and the USA National Championship in the same year. After competing in Formula Ford 1600, Formula Ford 2000, and Fran Am Pro 1600 and 2000 in the United States, he moved into sportscars in Asia.
O'Young's sustained success came in the Porsche Carrera Cup Asia. Driving initially for Jebsen and Co, the Hong Kong Porsche dealer team, he won his first Macau Grand Prix title in 2005. He took the Porsche Carrera Cup Asia championship in 2006 after winning both races at Zhuhai International Circuit. Returning in 2008, he won the title again with four wins and 196 points, becoming the first-ever double champion in the series. His 2008 season also included victory in the Macau GT Cup and a win in the Merdeka Millennium Endurance Race in Malaysia, driving a Porsche 997 RSR alongside Mok Wing Sun and Alexander Nicholas Davison, completing 308 laps across twelve hours.
O'Young made six appearances at the 24 Hours of Daytona across his career, beginning in 2010 driving a Porsche GT3 Cup for Vancouver-based Bullet Racing. In 2009, he entered the 24 Hours of Le Mans for the first time at the head of Endurance Asia Team, the first-ever Hong Kong and Chinese team entry in the race's 77-year history; the car retired after 16 hours. He returned to Le Mans in 2013 for AF Corse driving the No. 55 Ferrari 458 Italia alongside Lorenzo Case and Piergiuseppe Perazzini, securing second place in the GTE Pro-Am class after starting tenth on the grid.
At the Bathurst 12 Hour, O'Young achieved back-to-back outright victories. In 2011 he drove for Audi Sport Team Joest in an Audi R8 LMS GT3 alongside Marc Basseng and Christopher Mies, winning by 0.7141 seconds over the sister car after twelve hours of racing on the 6.213 km Mount Panorama circuit. He repeated the feat in 2012 driving a Phoenix Racing Audi R8 LMS. In 2015 he returned to Bathurst with Craft-Bamboo Racing in an Aston Martin V12 GT3 and finished third overall.
O'Young joined Bamboo Engineering for the 2010 World Touring Car Championship season, driving a 2008-specification Chevrolet Lacetti. He became the first Chinese driver to compete as a full-time WTCC entrant. He scored his first Independents Championship win at the Race of Portugal, finishing tenth overall, and arrived at the Macau season finale with a chance at the title before being eliminated in a collision with Tom Coronel. He remained with Bamboo Engineering for 2011, then moved to Special Tuning Racing for 2012 in a SEAT Leon WTCC, before returning to Bamboo Engineering for the final rounds. In 2013 he joined ROAL Motorsport, partnering Tom Coronel in a BMW 320 TC.
Throughout the WTCC years, O'Young accumulated two class victories at the Macau Grand Prix in the World Touring Car Championship Independents category, adding to his earlier overall wins at Macau.
In 2014, O'Young entered the FIA World Endurance Championship with Craft-Bamboo Racing driving an Aston Martin for Aston Martin Racing alongside Alex MacDowall and Fernando Rees, with a third-place finish at Fuji as the season highlight. He was also drafted into Audi's DTM line-up for the 2010 season finale in Shanghai to replace a dismissed driver. In 2015, O'Young won the GT Asia Series drivers' championship with Craft-Bamboo Racing, sharing the No. 99 Aston Martin with Jonathan Venter and Daniel Lloyd across a season that produced four wins.
O'Young's Macau Grand Prix record spanned seventeen appearances between 2004 and 2021 across multiple categories. He retired from racing after crashing out of second place in the Greater Bay Area GT Cup at the 2025 Macau Grand Prix.
Following his retirement from driving, O'Young moved into driver management. He currently manages GB3 Championship driver Bianca Bustamante.
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