BMW 330D 2006 with damage

Hello foros,
here I leave something to see if
the vehicle can help me present the following is a BMW 330D of 2006 it only has 53400 km
and it is already damaged alternator to the damage to it because I send it to fix truth and I am very well working quiet

after
was
damaged within a few months Coñazo get the starter engine since the multiple of admission had to be taken to get there and once repaired it was installed and put everything in its place but now it marks me since it starts it a checker of Check Engine in half shaded yellow and already takes it to the BMW but do not know what to do they say this say the other and the car lost strength I do not know if it will be a sensor that will flute where injectors go

If the light appeared immediately after the last repair, the most caused thing is that they left something disconnected, now to go to the grain, the ideal would be to put the scanner to see what he says and go to the point, now that of half shaded that you say you is what I do not understand you want is not the light of the check if not any of around and gives only a little light.

Hello friend, I give a council, before disconnecting battery you have to check the car to save what information has the UC, after checking and saver that info has your own UC, you have to disconnect, then you disassemble qualquer piece that works with a sensor, actuator, collector quales carry electric cables, because they are working with info and reach the UC, if you do not follow this process you can get to cause damage to a piece that work with electric, greetings