Got the P0410 code. Went through all the postings and came across one from an Oldsmobile person. Something I had not thought of. I was looking at all the sensors and gas cap. The ultimate fix was replacing the spark plugs. I had not done that in a while (about 50k miles). After replacing the spark plugs I started the car and the "Check Engine Soon" light was still on. I drove a couple of miles and had to fillup the gas. Started the car again and the "Check Engine Soon" light went off and has been off. Forgot, that sometimes it is the basics that need to be performed before looking at the sensors. Also, you will need a special wrench to get to a one plug, the one on the drivers side, because of the steering column. Thanks for all the postings.