Chevy C2 2006 problems when lighting

Hello! I just registered, because I don't know what to do with Chevy C2 2006 Standar that I bought 4 months ago ... when I understood everything well.
That if he took refinement, alignment and balancing, the shock absorbers were also changed and as he began to handle because I had to take him to put something to the carter, I think it is a cork, because he threw oil.
After this, the velocimetro 4 weeks ago does not work, but that is not the worst of the matter ... the key they gave me when they sold it, it was a copy ... and well I called the locksmith but 3 weeks ago he did not want to go after he finished making some purchases ... after a good time he finally turned on ... my brother told me to take him to the electric and this detected that I had problems that I had problems. So he said (the truth of this I don't know much) and well he said that he had to change his coals and change him, I also told me about the velocimetro and he told me that the Czechy (it should be noted that the mechanic told me that I could see I could see and if I could not This must turn on the "the cart" that is on the lower left of the velocimetro and already made the test and told me that I should go with the locksmith because surely the cylinder that the chip carries to me to replace my key since I did not connect with the antenna ... well, not to make the longest story ... I went with the lock that passed but that would go to verify it to the car for this, the SBB was carried (I think it is the device with which they schedule the key) and already being in the car and when putting the key (eye the locksmith does not handle Standar only automatic, that confessed a few moments before) realized that "the cart" that the electric told me should turn on when I turned on the car on it, it went on but then the cart Motor service indicator) and well told me I am going to program another chip but if there is no problem it is not the key of the key ... and well when I was programming the indicated SBB that had somewhat like that connection problems ... and I take a verb again that the key could not be that it should be the immobilizer, a sensor or some fuses that are under the steering wheel ... He told me that he was going to try with another SBB was damaged but also discard I am still a sensor or even the computer and that was going to take me with the man who makes computer diagnosis a few blocks from the locksmary but that was a miserable one, referring to prices since he never repaired anything that was always going to change the computer or change the immobilizer, under that reference preferred not to leave it with this person.
But I still have problems with the ignition of the car by the blessed "cart" (engine service indicator) when he wants.
By the way the electric says that this may not be something fuses or anything that is the key because the car worked well with the previous key and had not had problems.

Please help me tell me that it could be or if I must submit it to a scanner, my brother told me that in Autozone they do one and that they would tell me that it hurts so much to the Chevycito and so I took away from doubts or two is to take it to the agency and that they fix what they have to fix and make the key there.

Please your help!

Do not make this servant a little further from "constant danger" because of the phrase they tell us women when we are driving here in Mexico.

Greetings and I appreciate your comments in advance.

PD forgive so much word but I wanted to explain it as it has been.