HAMBURG -- Porsche said it would limit temporarily the number of models it sells in Europe, citing a switch to so-called WLTP lab tests related to car emissions and fuel consumption.

Porsche said its customers could get in touch with Porsche dealerships to pre-order affected models during the transition period. It did not specify the scope of the limitation or which models were affected.

Waiting times for the Cayenne SUV and Panamera sedan could be until at least March 2019, the Frankfurter Allgemeine Zeitung reported. The 911 won't be available until the autumn, it said.

The measures will extend testing to ultrafine particles, which cause thousands of premature deaths, EU data shows, emitted from a new generation of gasoline direct injection engines.

The new Worldwide harmonized Light vehicles Test Procedure (WLTP) standard, along with RDE on-road emissions tests, will go into effect in the EU on Sept. 1.

Porsche is among a number of automakers hit by the regulation changes in the EU.

BMW temporarily stopped production of some models in May because of modifications required so their vehicles comply with RDE on-road emissions tests. Volkswagen Group warned of potential bottlenecks as it seeks to get vehicles through the WLTP (Worldwide harmonized Light vehicles Test Procedure) testing. Renault CEO Carlos Ghosn warned that WLTP will impact the automaker from September this year to April 2019.

Automotive News Europe contributed to this report