The reason I asked is because if you use the correct timing tools and reset the adaptations you should not have a timing code. From experience if you loosen the intake cam sprocket "Vanos ". You can have problems due to the inner seals in the Vanos that are nolonger under tension. Then is oil pressure to adjust the Vanos unit is lost and then the DME does not see the camshaft in the position that it wants.