98 f150 4.6l had code 02 sensor reading too lean. replaced all o2 sensors. code still comes up. says running too lean. anyone have any idea as to what this may be? thanks.

 

What mods do you have and have you done any mods right before the code started?

Do you have an intake on it? If do, check to see if they're are any air leaks behind the MAF.

 

change your pcv valve with hose: back elbow cracked.

Marcos
Santo Domingo

 

vacuum leak somewhere. get a can of starting fluid, crank the engine and let it idle and start spraying around. when you hear the engine rev up, you've found the area and spot, then just look for cracks in lines or the problem area.