how come i am getting a p0602 code?the smarty says fuel calibration?

That error code normally comes from the Smarty... If you return to stock setting, clear your codes and run awhile you find the code never comes back till you put the Smarty back on again....

Yes 602/1693 are known as the "smarty codes" I get them.

thank you two very much!!

That is mighty interesting for sure. Kinda strange but sounds like an easy fix!