Be warned, this can be difficult as they can be seized.
I would suggest using a good knowledgeable mechanic that you trust.
On my old 2004 D3 which was an ASB engine code, I had a duff plug that wouldn't come out.
The garage tried all the usual heating, sprays etc but were reluctant to go any further than a particular torque wrench setting to remove it.
If it snapped, it meant removal of the head to drill it out etc. ££££
I left it and went with 5 working glowplugs for the last 2 years I had the car.
It always started fine with 5, slightly rough starting for 1-2 minutes on a very frosty morning which didn't bother me.
I used an auto electician to disable the flashing glowplug light in the dash as it was very annoying.
Hope you don't have such hassle with yours.
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