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I read all about replacing the injectors in sets of 3, but I think that pertains to n54. N55 doesn't have 12 revisions of injectors... The new ones I installed are the same part number as what was installed on the car at factory. The only revision BMW made was to top-mount the injectors after 1/1/11 instead of bottom mounting. Otherwise there's no difference. I plan to replace the other 4 injectors anyway, I just wanted to make sure this was the problem before spending money on all 6.
I didn't replaced the fuel sensor, but HPFP didn't end up being my problem anyway. If I see any HPFP codes I'll remember that and replace the sensor first.
VANOS bolt has been done on my car. Previous owner was pretty good about keeping up on maybe and recalls.
Edit - coils and plugs were done because when I bought the car the previous owner had receipts for the plugs 30k miles prior, and nothing for coils so I assumed they were original. The car drove just fine before and after replacing those.
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