“All other BMW diesel engines in the UK achieve the EU6 requirements through measures inside the engine, exhaust gas recirculation and NSC [NOx Storage Catalyst] technology.
“The weight of the vehicle also has a bearing on this, which is why BMW’s lightweighting technologies also have an important part to play,” he added.
Other manufacturers have gone on the record to say that they have not used devices to manipulate tests, with JLR saying: “Jaguar Land Rover does not use any emissions ‘defeat devices’ or software.”
A Ford spokesman said: “Our vehicles and engines – including our diesel engines – meet all applicable emissions standards, and they are designed to perform consistently both in the lab and on the road. We do not have any so-called “defeat devices” in our vehicles.
“We fully support efforts to ensure that emission standards closely match the real-world results that customers experience under normal conditions.
“We are committed to offering consumers high fuel efficiency and low emissions through what we call the “power of choice.” We offer customers a variety of choices ranging from our EcoBoost-powered gasoline vehicles and advanced technology diesels to hybrids, plug-in hybrids and full electric vehicles.”
Lamborghini, which is part of the Volkswagen Group, has also stated that it complies with the law, with a spokesman saying: “New Lamborghini models comply with the legal requirements and environmental standards in the markets in which they are sold. Lamborghini, on its own, is responsible for making sure, together with the respective national authorities, that these requirements and standards are met regarding emissions controls.”
Both Bentley and Porsche spokesmen have also confirmed that none of their vehicles have employed the software used elsewhere within the VW Group to manipulate emissions tests.
Renault has also welcomed more tightening of the testing procedure and says it has not used defeat devices in the past. A spokesman said: “We invite all those legislations and framework in markets we operate in, we don’t have defeat devices in any of our cars and we welcome the improvements that are proposed in Europe for the NEDC side of it.”
Mercedes-Benz denied the practice, too. “Mercedes-Benz does not use defeat devices which illegitimately limit the effectiveness of the exhaust after treatment system,” said a spokesman for the company. “This applies to every Mercedes-Benz diesel and petrol engine worldwide.”
The PSA group, Peugeot, Citroen and DS, issued a combined statement calling for stricter emissions tests, and also denied that it used any defeat devices.
“PSA’s Research and Development Department reaffirms that PSA complies with the approval procedures in effect in all countries where it operates, and that engine settings, assuming the same conditions of use, are identical whether for approval procedures or in real life.”
Read more on the Volkswagen emissions scandal:
How the Volkswagen story unfolded
Reports suggest VW was warned of illegal software 'years ago'
How VW's 'defeat device' works