He also became the ERC European Drivers Champion in the 2015, 2016 and 2017 seasons with co-driver Jarosław Baran in Ford Fiesta R5 driving for Lotos Rally Team[1] Since 2013, Kajetanowicz has won six ERC rallies.

In 2015 he won the ERC Drivers title over his main rival for the season, Peugeot factory driver Craig Breen, winning the Jänner Rallye, Cyprus Rally and the Acropolis Rally in the process.

In 2016 he successfully defended his ERC title with a win at the Rajd Rzeszowski, three second places (2016 Rally Islas Canarias, 2016 Circuit of Ireland and 2016 Rally Estonia) and a third place at the Rallye Açores.

In 2017 he claimed a third consecutive ERC championship with a win at the Acropolis Rally, and taking three second-place finishes at the Canary Islands, Rzeszowski, and Rome.

After four years of success in the European Championship, Kajetanowicz began the 2018 season with an uncertain future over sponsorship.