I'm not technically minded female at all and am struggling to understand how a golf can be so complicated!
Not just Golfs, any modern diesel car is much more complicated than diesel cars of several years ago. Diesel engines used to have a mechanical fuel pump which fed relatively simple injectors, timed and metered mechanically, would run reliably for high mileages but were comparatively noisy, low revving, heavier and lower powered than petrol engines of the same capacity.
Now most are 'common rail', turbocharged, operate at far higher injection pressures and timing/metering is controlled electronically, exhaust gas is sometimes fed back into the engine cylinders to improve emissions, particle filters are supposed to catch soot, etc etc.
All these complications are intended to make them, quieter, cleaner and give up to double the power of the old style engines. Reliabilty and 'fixability' in case of problems are, however, generally worse.
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