Dpf problems

I have a 2010 freightliner century class with dd15 engine been having a lot of problems with it recently as far as the regeneration process goes a while back I got a regen light that came on long story short it would go through the regeneration process but regen light would come back on flashing with the check engine light on I took it to shop they replaced doser injector doser block all the dpf sensors and baked my filter now about 8500 miles later i am having same problem again took it back to shop and they are trying to tell me that it could possibly be an injector issue or something else I'd any one has had a problem like this please help thank you. .

 

I apologize there fellas I am new to this forum. Yes it is throwing same exact code as before the one for high soot level.Mechanic told me that I should also take it to freightliner for a software update.This is a huge headache with this dpf I've already spent 1700 for all this before.Any advice would be greatly appreciated thanks.

 

OK first I hope I'm in the right section if not I apologize new to this site.I'm gonna try to get straight to the point here.I have a 2010 freightliner century class with dd15.Two months ago I had to take it to shop for a regen issue I would regen it but right when it finished cycle dpf light would keep flashing along with check engine light.Shop replaced doser block,doser injector,all sensors and baked filter.Yesterday I started to have exact same issue. Took it back to mechanic today and he said could possibly be something wrong with injectors or something else.I find this hard to belive as truck runs just fine he also said I might want to take it In for a software update. I would appreciate any advice anyone can give thanks.