We have a 2013 optima with the turbo, about six months ago it lost boost and would not run right so we took it to Kia to see what the problem was and it turns out it was a turbo failure. Kia wanted 3,000$ to replace the turbo because it was out of warranty by two months, we said no and my dad and I replaced it ourselves, no problems the car ran great. After about a 1,000 miles or so we got a check engine code p2300 I think so the RPM will not go over 17 or 18 hundred. Took it to Kia, now they are saying the engine is bad because the turbo needed to be calibrated with the computer and excess boost could have caused the problem, does anyone know if the turbo needs to be calibrated and would that cause the engine to fail? I mean I know to much boost can damage to thing in an engine but not like I put my foot to floor every chance I get.