Germany's auto regulator has ordered Daimler to recall 42,000 Mercedes diesels because the company installed illegal software in their engines that gimmicked the engine's thermostat, which would allow the manufacturer to selectively tune its cars' emissions.
Daimler disputes that the software is illegal and has said it will appeal (it says it showed the regulator the software in question last year); but it has formally advised investors to expect a one-time writedown of hundreds of millions of euros over the recall.
Today, the Daimler vehicles in question are Mercedes-Benz-brand vehicles that are only sold in the EU. According to a WSJ source, the issue relates to a coolant thermostat in the cars that protects parts of the engine. The related software is found on vehicles made between 2012 and 2015. The WSJ says the type of coolant thermostat used on the diesel vehicles in question is generally found on cars with catalytic converters that don't use selective catalytic reduction, an emissions-reduction technique that uses urea to reduce nitrogen oxides to less-harmful forms. But the GLK 220 CDI 4MATIC Mercedes-Benz models that must be recalled do appear to use selective catalytic reduction.
German regulator says it discovered new illegal software on Daimler diesels [Megan Geuss/Ars Technica]
(via Naked Capitalism)