Hmm
Never had tha issue but I’m prety sure it has nothing to do with the fuel injectors. Looks more like your DPF is clogged (is that the right word?) or the regeneration didnt worked well.
If you have an OBD2 dongle and techstream you can maybe start the cleaning cycle by yourself or you have to go to a workshop so they cam manually start this for you.
Bc the diesel starts every now and then a cleaning cycle where the DPF blasting out. Dunno if it is cycled by temp, time or kilometers. Normaly the motor ecu sets up the settings so you get up to 550C in the DPF so it cleans it self.
With that started cleaning cycle ypu should drive a longer distance with some nice speed and load for the motor so he can blow out. Maybe it started in your car a few times on short distances.
That should work normaly if your diesel quality is normal (that kind of diesel where you dont need to chance the diesel filter every now and then like in north africa
).
In case i would look at the dpf….
In worst case he is already that much clogged that you will need a new one or you have to send him to some place who cleans DPFs. If you are willing to you can also clean him by yourself with heat but yeah it is kinda tricky.
Would first try to start the cleaning cycle and the driving him a few hours with some nice load to the motor. Then youll see if it comes again. In worst case you need to get a new one what is sadly expensive with a diesel big like this.
/edit
depending where you are living and how your authorities are interested in properly working diesel filtering and periodically tested exhaust measures you can also think about removing the dpf……
