please remember volvo do not manufacture the injectors and didnt design them. The D5 uses a BOSCH fuel system and the unreliability of the injectors comes down to either a design fault or a production concern at Bosch. Im aware Bosch have had instances of a volume of injectors being faulty across all their product lines but Im not privy to the exact situation with the injector model used in the D5.
Volvo contributing etc and being aware of the fault is a result of dialogue with Bosch. either volvo asking them "what's going on!!?" or bosch volunterring the info.
volvo supporting goodwill towards replacement is indeed goodwill on their part and most likely also because Bosch is picking up the costs too.
Bosch is one of the better manufacturers but all have problems from time to time.
Common rail (and unit injectors but this doesnt apply to the D5) are very precise and in some ways 'delicate' or sensitive components. Truth be told, common rail systems are not as reliable as the previous mechanical injector systems. but....emission regulations and NVH reasons mean it is necessary to use it (first being more relevant)
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