FRANKFURT -- Audi's European sales fell 56 percent in September due to supply bottlenecks caused by the introduction of Worldwide harmonized Light vehicles Test Procedure Procedure (WLTP) rules.
The decline contributed to a 22 percent fall in Audi's global sales for the month.
Sales were hit hardest in Germany, falling 69 percent. Audi's UK sales were down 53 percent, and fell 53 percent in France, 52 percent in Italy and 60 percent in Spain.
China deliveries increased 13 percent and sales in North America rose 1.2 percent.
"Following above-average sales results in Europe over the past two months due to the sell-off of models in stock, the increasingly empty stores and the restrictions in the sales portfolio had an adverse effect on deliveries in September," Audi said in a statement.
Conforming to WLTP, which went into effect Sept. 1 has hit other automakers. Audi parent Volkswagen Group said the best-selling versions of all VW models now conform to WLTP rules, easing a delivery bottleneck that has hit sales hard.
Reuters contributed to this report