Old school mechanical injectors
If its old school mechanical injectors you can pull one and check it in the field no problem.
New common rail / electronic not so much (most no).
Two additional in line diesel filters are the answer. The first one should have a glass bowl so that you can see sediment or water, and the second with a replacement cartridge that can fit multi micron filters. All engines will run on a 10 micron filter, some on a 30 micron filter. Before you leave try the 30 and see how it runs, if its fine, run that but take a 10 micron spare.
I started life as a diesel mechanic and wouldn’t even try and do a field repair on the injectors in most post 2000 diesels. Screw just one seal up and you flood the engine oil with diesel. A good example of that is the Toyota Prado D4D engine failures - primarily the result of injector seal failures.
And if you are selecting a vehicle, and can get a petrol, it is probably the wiser choice nowadays IMO. Hard to actually say as I love diesels but petrols are far easier to fix - though they may throw a tantrum now and then, the tantrum is fixable.
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