The California Air Resources Board is notifying car manufacturers that it will enhance its testing of diesel engine emissions.
The move comes as a result of Volkswagen’s admission that it manipulated diesel emission tests in the US. Regulators say current testing techniques don’t always indicate how a car will perform on the road.
“We are now going to be looking at all diesel engines to make sure that they run as well in the real world as they have demonstrated that they can on the test bench,” says Stanley Young, a spokesman with the California Air Resources Board.
The Air Resources Board sent a letter to all vehicle manufacturers Friday notifying them of the change that will be effective immediately.
California regulators found that Volkswagen diesel emissions were ten to 40 times higher than they initially tested. The new procedure will involve a portable emission measuring device.
The Air Resources Board and the US EPA are working with Volkswagen to evaluate potential recall solutions for affected vehicles.