In 2001 Priaulx had a pair of British Touring Car Championship (BTCC) guest drives for the Egg Vauxhall team, standing in for the suspended Phil Bennett.

He stunned the regulars by taking pole position on his debut at Oulton Park, demonstrating that his future appeared to lie in that direction.

He won one race and finished on the podium in two others, and the following season was signed by Bart Mampaey's BMW UK team for their European Touring Car Championship (ETCC) effort.

2004 saw Priaulx win a major circuit racing championship, as he became ETCC champion after a season-long battle with Dirk Müller.

Priaulx repeated his 2004 success in 2005, 2006 and 2007, clinching the World Touring Car Championship (WTCC, essentially the same series, with two races outside Europe in 2005 and three in 2006) at the final round in Macau.

In 2005, he won the crown with two second-place finishes in the final round when his nearest rivals, Dirk Müller and Fabrizio Giovanardi both failed to score.

Heading into the final meeting of the 2007 WTCC season at Macau, Priaulx was joint leader of the championship alongside former BTCC champion Yvan Muller.

[13] On 5 December 2015, it was announced that Priaulx had parted ways with BMW after a 13-year stint with the German manufacturer to join Ford Chip Ganassi Team UK for their upcoming debut in the 2016 FIA World Endurance Championship season.

[14] He was officially unveiled as a Ford driver on 5 January 2016 alongside teammates Marino Franchitti, Stefan Mücke, and Olivier Pla.