CODE HELP FAST!!!

[SXYXC]

ok so i just pulled up a couple codes of my car becuase its cel light was on this is that i got..
P1151 Lack of H02S-21 switch, sensor indicates lean and P1131 lack of H02s-11 switch, sensor indicates lean...

I havn't touched my O2 sensors all i have done is hit them as with my bolts with some PB blaster to make them easy to get off... what could be causing this?? and for both of them to read this?? what gives??

 

[cooper]

I wish you good luck, my car has been giving me the p 1131 code about 4-6 months now. i've changed the pasenger o2 sensor (up stream) I'll change the driver side tomorow or the next day to see if that helps. the car runs fine but , it stumbles and has a hesitation when its first started. A quick burnout seems to help if im frustrated!?

 

[screamin gt]

I wish you good luck, my car has been giving me the p 1131 code about 4-6 months now. i've changed the pasenger o2 sensor (up stream) I'll change the driver side tomorow or the next day to see if that helps. the car runs fine but , it stumbles and has a hesitation when its first started. A quick burnout seems to help if im frustrated!?

I'm having that exact same issue. it only has that stumble when I first take off and then its perfectly fine like nothing happened.

had the p1151 code prior as well, cleaning the maf sensor fixed that one.

only thing I changed is cai and had the heads port polish and valve job.