How to check: Diagnostic Connector
Open the hood and locate the diagnostic connector. Is it next to the battery and can be seen in the figure to the right. You will want to connect terminals E1 and TE1. I used a big paper clip, which I leave in the back of my car, and it is actually 'sprung' against the connector lid to add some pressure for a better connection. Clicking on the picture will give you a much better view. It might be hard to see in the picture, so the bottom figure illustrates the terminals to connect, in red, with the paper clip.
After you do this start your car. The check engine light should now be blinking. If it is continuos quick blinking then you are fine there are no error codes, otherwise you have to count the blinks. Each set of blinks will represent one digit with a longer pause to separate digits. There may be more than one code present, but it is on a continuos loop. For example if you saw blink...blink.......blink...blink...blink...blink....... that would be a code 24. After you are done you can clear the codes by pulling the EFI fuse (15A) in the fuse block right next to the diagnostic connector for 30 seconds or more, make sure the engine is off.