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I will chime in from my own 2010 m57 with 248k km current experience. Been throwing both 4595 smoothness regulator and 4B25 zero quantity adaptation on cyl6 for about 6k km since early September. (this started in conjuction with a Nox sensor code issue) Last week, for the first time, the car started to shake at idle at stops and now I am getting a cylinder 6 misfire code 4CE6 in addition to the other 2. The shaking in my current Ontario winter weather only starts once the engine is well heated up and been driven for some time. the issue is intermittent, at idle in drive with foot on brake, a big pump of gas will fix it most times, however only got progressively worse over last couple of days to undrivable state.
I sourced a new injector on ebay for cheep and will be installing this week.
will report back once done but can't see it being anything else. Looks like, smells like, acts like, likely is the injector.
Given your codes, I would start shopping around for an injector on ebay so you have it on had once you start misfiring and the x5 becomes undrivable.
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