Lean Condition
 

My new to me 2011 GT throws a lean condition code under medium to hard accelleration. I cleared the code and cleaned the MAF sensor-all I could think of.
Haven't had a chance to test it yet. Do you think a dirty MAF might have been the problem. I have all of three days left on the dealer's 10 day warranty.
Advice please?

My mistake. It's a 30 day warranty. Anyway, the CEL came back on and I again scanned a lean code. However the CEL went out by itself but I still scan a lean code and also now a stuck O2 sensor code. The CEL checks OK at startup. What would cause the CEL to turn off without being cleared?

Did anyone put a bigger air intake on and not adjust the tune to compensate? That will show a lean condition.

As far as I know its stock. BTW, does a stock 2011 GT air cleaner box say "cold air intake"?

Yes, the box says CAI, because it actually is. Have a look between the MAF and throttle body for any air leaks. Additional air entering here will be unmetered and cause this. Both banks lean? That means it is something they share, like TB, air tube, maf sensor gasket...Don't forget the vac line fitting(s) on the intake tube, both ends are sources of unmetered air, potentially.

Thanks, I'll chech it all out.

I can't say about a 2011. I have a 14.