I’ve removed the keys but something in the engine is still going!!

[HeidiF]

Apologies if this is a really daft question. We’ve just driven our new (to us) motorhome for about half an hour and stopped to make a coffee and there’s a roaring noise under the bonnet. I’m not very technical (clearly) but I’ve taken the keys out so I can’t think what/how this could be. Help!

 

[RYHALLRED]

My 2022 Ducato did this yesterday and you could smell it, I actually thought I might have overheated to the extent I got back in to check the temp gauge
Just an ancillary question, I have the 9 speed auto and I usually select eco because I thought it would be more economical, I do know about DPF regeneration, to a small extent but do you think I should run it on the other settings and if so at what intervals?

I have the 9 Speed Auto and also run it on ECO where suitable. The Ducato has active DPF regen, so in theory you can dive like Miss Daisy all day, every day & all should still be fine. Don't even think about it TBH. But it does make sense that long runs rather than short start / stops are much more preferable.