My sen1234567rvice engine light is on. I took the car to my mechanic and he ran tests. The error codes showed EGR problems. My mechanic changed the EGR valve and did other repairs but the light came on five minutes after I received the car. I even gave my mechanic the dealer's printout with the things that needed fixing according to the dealer. What should I do now? I have a acura rl. By the way, the code says EGr insufficient air flow