More that they just like the car.
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Same for Toyota,or for that matter Ford a few years back.
People have short memories,Ford was fined a huge amount,one of the biggest fines in Aus corporate history and had to give thousands of people new cars.Their issue was not emissions related,more to do with unconsciable conduct and lying to customers.
Did it make any difference to their sales?
I doubt it.
I don’t know about Ford at the time,but Toyota sales seem to continue to boom,at the moment,so one would think these class actions make very little difference to sales numbers.
To be fair, probably all vehicle manufacturers had issues with DPF's.
Jaguar Land Rover facing class action over allegedly faulty diesel particulate filters
I found this video quite a few years ago which explained the different DPF designs quite well, and also which designs were not so great to put onto a vehicle. Needless to say these are the ones that many car manufacturers have gone with.
Understanding Diesel DPF Regeneration - YouTube