My pops had a CEL come up on his Impala. Nothing major as its a p0411 setting for secondary air injection. went throught circuits with test light and TECH2 and all is good. parts need replaced. parts are $400. so my question is when i go the the diagnostics on VCI editor and chose the DTC P0411 it claims its a "no error reported" under the error mode. but it does actually set and CEL. if i spend the $100 to check the box on write the ECM will it eliminate the light? im super confused. is it an emissons thing? dont want to spend $100 for no reason.