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have you pulled the high pressure fuel pump off the end of the head, and seen if the cam follower is worn through? If you have wear on the cam lobes, it is usually due to grit from the wearing of the cam follower of the pump, and you will need to replace the cams. Most likely when you pull the pump you will find the cam damaged there.
let me know what you find.
The high pressure pump has a shaft- on the end of this is a cap (cam follower), almost like a piston, that fits on top of that shaft, and the end of it runs on a cam lobe. What happens is that over time, some of these followers will start to wear, becoming dished in and worn on the end that runs on the cam lobe. And in extreme cases, it will wear all the way through, leaving just a sleeve without an end, and the end of the pump piston will start riding on the cam lobe itself, destroying the pump and the cam (the follower already having been destroyed through wear)
HERE is a page with pictures of a damaged follower, pump, and cam
Sorry, I misread the engine code. How long does it take to start? Does the glow plug light come on for the normal amount of time when key on? Have you scanned it for fault codes?