This brings up a point that might be good to mention to the novice mechanic. If you check the DTC codes and have a number, you can always type the code [in this case P0622] into your search engine on the internet and you get all kinds of information. I did not have my DTC chart in front of me, so that is what I did in this case. Also, the DTC code will not tell you exactly what is wrong, but it indicates where to look. There may be other problems, but it is a place to start. ...J.D.