My buddy has a 2010MR-T with a TBE, Intake and UICP. He recently got a retune because he added a GM 3-port and after the first reflashed he had P050B pop up. It does not happen every time he starts his car but it still happens frequently from what i am told.

I checked out the code and it says to clean the throttle body and replace the thermostat but if that doesnt work, the ecm needs replaced. I dont think it is a hardware issue since it happened after his first reflash of his retune.

Does anyone have any ideas what could be the issue with his tune?