2004 G35 with 56600 miles on it you just got the oil changed and the car started to idle rough too low and than engine light came on What is going on?

All 2004 automobiles sold in the United States are controlled by an on-board computer. The computer includes diagnostics that can tell you when something isn't functioning properly. You should be able to go to your local auto parts retailer and depending on where youyou live, you might be able to borrow a code scanner that will tell you what's wrong. Often the sales staff will help you connect the code reader and help you figure out what it all means.
Code scanners are amazingly accurate and are a valuable tool even for the driver who is not mechanically inclined. It's not possible to tell you why your vehicle isn't functioning properly from the short description of what it's doing, but your computer knows and the fact that the light is on tells you that the computer is waiting to tell you what's wrong.

First answer by Redbeard. Last edit by Redbeard. Contributor trust: 2107 [recommend contributor]. Question popularity: 5 [recommend question]