I had same issue last year and they have to go in the plate value . Clearly pushing diesel off the road .
I actually just give it a 15 min blast on the motorway at 70 in 4th gear and also changed the air filter.
I was quite surprised how dirty it was after just 4000 miles ISH.
Anyway it passed much to the disappointment of the mot tester .
Good luck anyway
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Changed everything that needs changing and everything that didn't .
It's called preventive maintenance.
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