So i was driving home this weekend car started to idle funny and the ses light came onÂ* next time i started it. I reset the code by unplugging the negative battery terminal to see if it came back. Car drove fine and idled fine until the next day. Then idle became ba again and ses light came on. Pulled the code this morning to find it was an P0403 error code. So my question is do i most likely have to replace my egr solenoid?Â* Even if it is that went bad am i wrong to assume it should be covered under warranty even with mods?Â* Any suggestions?