2016 Nissan Navara D23 NP300
Potentially, inititally they thought it was DPF only, but they are now being more thorough. I believe they have the "master technician" looking into it now, along with the workshop foreman.They are probably foxed because the workshop manual doesn't tell them what to do.
Yeah, auto regen failed by the sounds of it, hence the manual. After the manual, there was still plenty of buildup hence the professional clean using DPF chemicals and pressure.Could be oil starting to pass the valve stem seals causing the smoke this won’t be picked up with a diagnostic scanner, Regarding the dpf the control unit will carry out a auto regeneration when the soot content in your dpf gets to a certain level,
Will hopefully find out more today, missing the Nav that's for sure.