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Germany's Volkswagen has warned its principal manufacturing facility in Wolfsburg faces short-term shutdowns later this yr, owing to new emissions check requirements.
It plans "closure days" to stop a build-up of automobiles which have but to be authorised on the market.
From September, extra rigorous EU requirements apply, designed to duplicate actual driving circumstances extra intently.
Now VW says it doesn't have sufficient testing tools to cope and fears that a backlog of vehicles will ensue.
At an assembly with unions on Wednesday, chief govt Herbert Diess admitted that assembly the new necessities, and getting new vehicles authorised on the market, was proving a problem.
"We will only build vehicles after the works holiday that fulfil the new standards. The deliveries will take place gradually as soon as the necessary approvals are there," Mr Diess instructed workers.
"But many vehicles will have to be warehoused in the meantime. To make sure their numbers don't become too large, we will have to plan closure days through the end of September," he additionally stated.
VW continues to be going through fallout from the scandal over its emissions dishonest, which erupted in September 2015.
Last month, former chief govt Martin Winterkorn was charged by US prosecutors in Detroit with conspiring to mislead regulators.
The agency was discovered to have falsified diesel automobiles' emission ranges by putting in software program "defeat devices" that allowed the automobiles to carry out higher in check circumstances than they did on the street.