P0410 code

Have you checked to see if the air injection ports in the exhaust ports in the head are clogged?Sounds like they are.

On cold starts the air injection solenoid gives the combo valve vacuum? The combo valve holds vacuum? If all these answers are yes you have clogged air injection ports in the head or exhaust manifold or both or you have a bad o2 sensor in the exhaust manifold that is lazy slow to change.

Yes you are correct there is a p0133 front o2 slow response but there is always a exception to every rule. Just recently had a 1999 sw2 with p0410 code went over everything was good. But when I watch the front o2 sensor readings they didn't drop bellow 200 mv on the scan tool like there supposed to with the air injection system on. So I replaced the front o2 sensor codes gone. I am a factory trained saturn tech and have worked for saturn for over 16yrs. So I know these cars really well. You should never blow air thru that vacuum check valve its designed for vacuum. You probably blew it out. But as long as the combo valve is getting vacuum it shouldn't set the code. You have to put the front of the car up on jack stands. So you can unbolt the down pipe so it will drop down when you remove the nuts from the down pipe to the exhaust manifold. Also you will have to unbolt the ac compressor and bracket and move it aside. The way the ports in the head work is they start by going straight in thru the manifold. Then you will see the port seperators on each port coming off the head. In the port and on the side of the seperators is where you will find the exit for the air injection ports. Exhaust is always going by them and thats how they get clogged. Especially if your buring oil which those engines are known for doing.

Also the one with the p0410 code that the o2 sensor fixed the code didn't have a o2 sensor code only the p0410 code.

I would say no especially if it goes in the oil iam not familiar with that product. At the dealer we pulled the spark plugs. Then took gm top engine clean put equal amounts of it in each cylinder. Then let it soak then crank it over to blow it out into rags. Then put the plugs back in then blow it out by running it. Then change the oil with synthetic oil and replace the pcv. Thats a saturn bulletin I can get you the gm part number if you want I have a bottle around somewhere. Also get a product called deep creep made by sea foam its a penetrant that will free bolts and eat carbon.I use it all the time when you donate make sure you say this is for saturntech9 help. That way I will get credit for answering your questions.