left bank lean

[98mustang2007]

Hi everyone ,my 98 with dual exhaust has check engine light on. When i had it checked out scanner said left bank running lean.mechanic
ran real time test and said left o2 sensor working but always sending lean signal.have had car about 6 months and light has always been on.mechanic said may have small hole in exhaust causing problem.does anyone have any suggestions.roll tide

[crazeflier07]

I have the same problem come up with my car all the time. I would spot weld the hole first and see what happens.
~Jon~