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'14 3.6R Outback
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Too lean?

I'll assume for the moment your mechanic is smart but just in case I always check the "ya, duh" items.

Air cleaner, air box, MAF, throttle body... a good dose of sea foam in the tank and some in the intake could not hurt to clean everything out. I would highly suspect an air system problem.

Start with air system and all related parts. If they all check out check the fuel system.

If you have duel exhaust, one bad O2 will not give the code on both banks so that would suggest the new parts are working (does this car have a "Y" pipe?). Sometimes new parts do fail but experience has shown me not to assume that from the start.
 
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