It means that the engine power has been reduced - either automatically when the brain of the car has detected a mechanical problem in the engine or you have engaged the rain mode.
Usually this happens when you use a low quality fuel. But i've stumbled on rare cases when the Vanos sensor valve was the cause. The only way to precisely tell which is expensive and implies a visit to a dealer.
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You probably have fc 2a87 and 3100 stored, they usually will appear with each other, 2a87 is in relation to intake and exhaust vanos solenoids and 3100 is in relation to the turbos, the correction could be relacement of solenoids, a software update or as serious as turbo replacement and the electronic actuators arent allowing boost pressure to properly build. a quick way to check this is to rev the engine to 4 - 4500 rpm and release at standstill and listen for a clicking or ticking noise that will disappear on and off, you will aslo notice this noise if the turbos are bad when you shut off the engine, realistically you should go to a dealer to check it out as they may help you with costly repairs as this is a known failure of the 335 engine components
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