After changing injectors because there were errors in the computer the car behaved worse than before. Came back 4 times, was told everytime it was fine, until they said they couldn't do anything and sent me to the dealership. They got the technical services help saying it was the EGR, never got even a quote on the price for checking, even though this was covered by my insurance. Only constant: your car is fine, and then it wasn't.