Hi everyone. I have a 2011 335i convertible (N55
engine) with 67,500 miles. Recently, 1 hour into a spirited drive with auto in manual mode and revs around 4000 RPM, the service
engine soon light came on along with that half black/orange motor symbol. In park the engine would shake the car on revving. Turned off car for 15 minutes and car was fine. Brought it into an indy shop specializing in BMW, Audi & Porsche. Mechanic computer scanned and measured values to find that #6 injector’s is failing with higher resistance than rest. Rather than replacing a single bad injector, he says that all 6 injectors have to be replaced together – despite the other 5 being good - because they work together via computer. Cost of replacing all 6 injectors is $3000 +. At this point all we did was replace the spark plugs. He said I will have to do the work soon as this misfiring & engine shaking will get worse. So is this mechanic correct? Do I really have to replace all 6 together instead of just the bad injector? $3,000? I’d appreciate your input on this….
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