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2007 BMW M6 Coupe - Page 9 Questions & Answers
What is the 2851 error code on E90 BMW 320i 2009 model
I believe it is referencing your Valvetronic adjuster motor, the one that advances (changes) the timing of the valvetrain under varying RPM. Here is an excerpt from a do it yourself fix if you are mechanically inclined:
Recently I had a E90 320i come into my shop with the mil light on and running on half power. A scan of the vehicle indicated valvetronic servor motor internal failure. On testing the valvetronic servor motor I found it to be working.
The problem was it was not advancing the valve timing thus the half power of the engine. If you ever have this problem here is a fix that works. Remove the servor motor and. With a screwdriver push the eccentric shaft gear as far back anti clockwise as it can go. Insert the servor motor and connect its 2 pin plug. Them switch the ignition onto position 2 and withing a space of 15 seconds depress the accelarator pedel down to full throttle 10 times and you will hear the servor motor program itself back to factory spec. Re-fit the valve cover and problem solved. I hope you will find this post useful.
Good luck...
Diagnostics Codes $7E8:Engine
fault codes $7E8 Engine and $7EC . trying to see what I need to replace or look at to fix codes. the answers are very vague as to fuel or engine.
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