If you have an D5 Diesel engine with high mileage, you want to check your EGR mixer. Here you get a buildup of gunk from the air that goes to the engine. Inside the EGR mixer the cold air from the intercooler mixes with the hot air from the EGR. Some say this is the cause of this gunk buildup, and some disable and blank the EGR. Other say that the gunk will just build up anyway. I think this take long time to build up. But after 250 000 kms / 150 000 miles, you could have a lot of gunk.
It's a bit messy, but not a hard job. However I would recommend to disconnect the battery first because it is easy to short circuit the engine starter in that area.
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