2006 crevrolet trailblazer p0171 code lean

[Silver_srt4]

I do not know what is really the problem in my car. The car is giving me the p0171 code and it says lean mix. I already checked for a leak around the intake manifold. I replaced the maf sensor and the check engine light still on. I do not know what to replace next. Any help I will appreciate.

 

[zora]

Look at the "cause" section of this link

http://www.obd-codes.com/p0171

 

[Silver_srt4]

Thanks man it really gave lot of help now I will replace the front o2 sensor to see what is the result. I will post the result....

 

[Silver_srt4]

I replaced the front o2 sensor and the check engine ligth still coming on I dont really know what is the problem now. Do I have to replace the sensor in the back, any suggestions please. I do not know what to do...

 

[zora]

Did you go through the list on the link? Did you do a fuel pressure test, etc.?

 

[Silver_srt4]

I did everything on the list, replaced maf sensor well is the sensor attach on the intake tube, also replaced the front o2 sensor, checked for any leak. Tdoy I am going to replaced the back o2 sensor. I can I do a fuel test that is new for me man..

 

[Silver_srt4]

I replaced the back o2 sensor and the check engine light came on after an hour of driving the car. What I notice is that my car right before the light is going to come on the car start to have like a little rough idle. It is so little that I can barely feel it but is there. I don't know what to do next.....����������