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??

 

Why would you spray them? Installing exhaust.

 

so i can change them out.. last time i had to remove one it was a major PITA

 

Your car is probably running lean. Whats done to it.

 

K&N air filter and flowmasters...

 

Did you reset the computer and see if it comes back?

 

i reset it and now it says P1151 Lack of H02S-21 switch, sensor indicates lean and H02S-21 not working correctly to low of voltage... its really making my car run shitty

 

major problem now... my car is running way lean you can smell it... and its saying that the pass side bank 1 O2 sensor has a low voltage!! what do i do to fix that..

 

Check the harness for the 02 sensor, make sure there's no fraying or cracking at the sensor and make sure the harness connection is clean (use dielectric grease on it once you clean it out). If that doesn't do anything, then I'd move on to replacing the sensor (use Ford original)

 

I would also do a close look throughout the motor for cracked or loose hoses / connections. Could be a vacuum leak also in there somewhere. MAF plugged in?

I use WD40 and spray around suspect hoses with motor running, if idle changes when you spray a spot, you have a leak.

However, a lean condition usually spits out a 02 sensor lean reading, not a low voltage reading. I still think there's a sensor problem.

 

I would switch 02 sensors,reset batt then see if code moves to other side of block. If it does then your 02 sensor is bad.

 

ok, 1 more question. would it cause an O2 sensor cause a error code that just reads Car to lean (bank 2)??

 

Could be alot of things but the last thing you did was spray the 02 sensors then you had the problems so I would say 02sensor.