Volkswagen has stopped delivery of a popular van line due to concerns over emissions.

Citing German magazine Der Spiegel, which did not identify a source, Reuters reported VW tests had shown that T6 toxic nitrogen oxide emissions in part significantly exceeded legal limits as VW had set an emissions-related 'adjustment factor' too low when seeking KBA approval for the model.

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"VW commercial vehicles is looking into signs that certain technical data… cannot be fully confirmed" by reviews of the T6 model's actual and planned emission levels, a spokesman for VW's van division told the news agency.

Intriguingly, given the last two years of Dieselgate, the spokesman reportedly ruled out the possibility engine management software was the cause of the "uncertainties" and said VW had agreed with the KBA to run further tests.

The VW commercial vehicles' Amarok pick up truck and Caddy models were implicated in Dieselgate as they also had been offered with the engine at the centre of software manipulations, codenamed EA 189.

The van division spokesman did not comment to Reuters on engine types, the number of vehicles affected or when the models in question were built.

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The KBA also had no immediate comment to Reuters on the matter.

Separately, but also reported by Reuters, Russia's standards agency Rosstandart said it had been informed about the recall of 30,777 VW Polo cars sold in Russia in 2015-2017.

The vehicles were being recalled due to a defect which might prevent the engine starting, Rosstandart said.