[shorod]

I would not suspect an oxygen sensor, especially since both banks are reporting an issue. There would be a separate oxygen sensor for each of the banks, you might get both O2 sensors for $150, but I don't think you'd get two sensors and a MAF sensor for $150. All too often the parts sales folks (not usually techs) will equate "lean condition on bank 1" to mean "needs a bank 1 oxygen sensor." Often it's quite the opposite, the properly functioning oxygen sensor is correctly detecting a lean condition, but rarely is the oxygen sensor the cause of the lean condition. You could replace "lean" with "rich" if you preferred. I think you're on the right track with looking for air leaks. Vacuum leaks or the intake air tube after the MAF sensor would be where I'd start my search. If the intake air tubing is loose or not installed properly it could cause issues, or it might have cracks in it where it flexes. The age of the vehicle is such that it wouldn't be surprising if the now brittle vacuum hoses have split, cracked, or no longer make a tight seal.

The code definitions mentioned by your wife over the phone are partial and do not include the code identifier which should be in the form "P0123" where '0123' would be numbers identifying the particular powertrain code.

-Rod