P0171 Opel Corsa 2012 1.2

Hello good nights! I tell you .. I have an Opel Corsa 2012 1.2 Selective Model.
Motor fault in the light box is turned on. He took him to the workshop he put me to the computer and gave P0171 mixture of poor combsutable. I erased the light and 10 km. He turned on again.
The light there are days that I have it on and others turned off, without any specific reason since I travel the same path every day.
I have returned to carry (it coincided with the light off) and gave me the same fault P0171.
The car works normally, they have told me that it could be the Landa probe. And if so, how much does it cost? Nor have I been able to assure me that it is. I'm not sure what to do.

Thanks in advance for the answers

Hello .... the code indicates poor mixture. I do not think it is the Lambda Zonda that is peripating the problem. To diagnose that condition I recommend you go to someone who really understands the subject ... you will hardly solve something by changing pieces.
Poor mixture may be due to low fuel pressure ... airfugas in admission ... dirty quadalimetro ... etc. It is a code that requires research since this condition of poor mzcla can be seated to several causes.SL2

Hi Cecilia.
How are you?
I've been looking at the Potra.
I have not looked at your specific model since I do not have this engine code information, Ecet ...
the possible causes they put in the program are:

1posibility is.
Leaks in the admission system.

2 Possibility is:
Secondary air injection system, air volume flow sensor, pressure.

3 Possibility is:
fuel pump, injectors, oxygen sensors.

If you remember you explain to us what happened to the car.
All the best.