If it's electrical fault cleaning will not help. And good luck finding injector, all good engines are sold complete with injectors and there is not much being broken for parts. Couple of years ago I ended up buying one from dealers. You might try ebay.de but when I was looking for it there was only one listing that was selling whole set of 8 with injector rail and pressure regulator and it was EUR399. You might be more lucky than me.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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