PARIS — Chris Froome failed a doping test during the Spanish Vuelta in September and is facing a suspension from cycling ahead of his attempt to win a record-equaling fifth Tour de France title.

Froome won his fourth Tour title this year and followed it with a victory at the Vuelta. But Team Sky said Wednesday that Froome, who has not been suspended, had a concentration of asthma drug salbutamol two times higher than the World Anti-Doping Agency’s permitted levels.