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1) No but there have been reports of derises in the injector rail causing running issues
2) Depends on fault(s) but normally no.
3) Depends on fault. You still have warranty on the remaining injectors and the new one is covered under BMW's limitied new part warranty at the very least.
4) only tests are basic diagnostics and performance tests - the manufacture can test spray parterns, flow and response etc but needs a very expensive and specialied rig for Di injectors due to their working pressures etc.
If it was you company and money would replace all parts just because one fails? Think about it - you have four tyres, all do the same journeys and miles, one blows, do you replace all four... answer depends on failure - a nail in one doesn't automaticly make the others need replacement - it becomes your choice and personal opinion. As a customer it just feels nice or right but this has no engineering or buisness merit.
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