Renault Implicated in Diesel Emissions Cheating

Although the diesel minivan passed existing EU standards, DUH claims the testing allowed Renault to undergo testing at artificially low engine temperatures.

The study was reportedly published in cooperation with both the University of Applied Sciences in Bern, Switzerland, and the International Council on Clear Transportation. The latter is the same organization that commissioned the investigation into similar issues with Volkswagen's diesel engines. The Renault study was undertaken on an Espace van with a 1.6-liter diesel engine that, despite being Euro 6-certified, was found to emit up to 2.06 grams of NOx per kilometer, or more than 25 times the legal limit. That study has yet to be independently verified.

If the allegations prove to be true, Renault wouldn't be the first automaker caught out by such third-party testing. In the wake of the VW scandal, DUH issued a similar report alleging violations by the Zafira, a comparable minivan produced in Europe by General Motors subsidiary Opel. Along with other parties, DUH and the ICCT are calling on European officials to mandate stricter testing procedures that would close loopholes left open under current testing regulations. Such reported loopholes currently allow automakers to optimize the engines to run at artificially low temperatures, strip out standard equipment to reduce the vehicle's weight, tape up door joints, and fit bald tires with lower rolling resistance.