Volkswagen Passat

I need to know urgently that in my Volkswagen Passat 1.9tdi 130 Edition of 2005 (Caja Vieja) it has put me in the workshop control table: emissions and I have been lit the symbol of escape system failure that put in the book, my question is, could it be that the shadow Lamba was annoyed?, I would appreciate an urgent response, 1 greeting.

What fails is the one that presents you

In principle the car is going well, I can even tell you that it still walks more than normal, but I get the workshop symbol: emissions in the control box, I suppose it can be from the Lambda probe but I don't know, 1 greeting

Excuse me to be called the Lambda probe?

The Lambda probe is the one that is responsible for sending to the switchboard the amount of gases that come out through the exhaust tube