Germany's KBA motor transport authority has approved Opel diesel engines following an investigation into whether they used 'defeat' software to hide high emissions, reports suggest. Opel was investigated by German authorities after it admitted that its Zafira minivan has engine software that switches off exhaust treatment systems under certain circumstances. When the investigation was announced, General Motors insisted the system software was legal, as it shuts down exhaust treatment systems under certain speed, temperature and air pressure conditions to protect the engine, which is allowed under EU regulations.
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