Mixture too lean?

[criledo]

CEL displays a "mixture too lean" on both left and right banks. Some say O2 sensors (which I don't believe and cost +$ 200 all three), others say cracked intake manifold (labor cost is astronomical). Appreciate any comments.

 

[Howard]

Which engine ? A lot of times it's just a o ring job on the inlet manifold. Also check for vacuum leaks.