something high consumption

Hello good I have a 2003 Picasso with 95,000 km. And the consumption has been overlooking me an average consumption of 10l./100 km. And I am half for urban and half on the road a year ago they changed me in Citroen the crowd and blew a paston, the curious thing with the car started the engine and stopped the car I look at the average consumption and it goes shooting I see something strange I do not know what to do, it has all the changes made of gas filters of gas and oil, in power it does not perhaps go something more pearly. 7 liters of medium does not happen, my conduction is not aggressive, please make a handle, thanks and greetings.

The first thing you have to do is clean the caudalimetro well, check that no pin of it fails, and also see the smoke made by the car when giving it a apartment, because it can have some injector that injects more.

First of all I ask you a question. Did you change by chance this last time the silencer, catalyst or something of the entire escape pipe?

They changed me in Citroen my body and told me that the injection according to the diagnostic machine injected well, then on the second answer I have not changed it neither the silencer nor the catalyst, the smoke that made when accelerated is white but little, thank you and greetings.

I asked you that because sometimes; in cars with catalyst; They have the famous Lambda probe at the exit of this. The probe serves to control the emission of exhaust gases and works according to the temperature that records the catalyst output (some models have one at the entrance and another at the output).
According to what measures the order to the engine computer and "order" that it injected more or less fuel.
I could be failing this probe. It's just changing it and it is usually not expensive