Germany’s carmakers are expected to agree a plan to cut harmful diesel emissions, at a summit with top politicians in Berlin.
The industry is under huge pressure to help curb air pollution, after the diesel emissions scandal, which exposed cheating to manipulate test readings.
The reputation of a key strategic industry is at stake. Car firms provide more than 800,000 jobs in Germany.
Firms including VW and Opel are likely to offer software updates for engines.
But agreement on a much more expensive fix – retrofitting diesel engines with new components – is unlikely, correspondents say.
The software updates, for about two million cars, will cost about €300m (£268m; $355m). The aim is to make older cars compliant with EU air quality standards, to cut the amount of toxic nitrogen oxide (NOx) they emit.
The pressure increased last week, when a court in Stuttgart upheld a proposal to ban older diesel cars from the city.
It is the home city of Mercedes and Porsche, and one of Germany’s pollution hotspots.