Opel Vectra 2.0 DTI

Good I have an Opel Vectra 2.0 dt of 2004 Well the problem is that I reside in Ukraine and the workshops here are very fudge I have an idea of ​​basic mechanics and I would like to know 1-The car turns on a light of a car with a key and it does not happen to me of 2900 refunds that can be 2- As I remove the light of the oil change. That can be related to point one point or is separate and I think it can be the caudalimetro but I am not sure for that I ask for council and help