Quoted:
I thought P0410 was actually not enough O2 in the catalytic converter-usually because of a problem with the air pump system. However it also means that usually the oz sensors are working correctly, that was my understanding.
Maybe its the check valves, do you have a way to check them, I have no clue how to. Mine has one per bank (v8)
Also, I think you can test the air system by resetting the codes once the car is hot and then starting/stopping the car several times and if it does not come on its something to do with the air system. I have been told the air pump comes on for only a minute or so when the engine is cold, thats when it throughs the codes?
Mine was showing a P0410 and then after a while(not sure of the time frame) I got a Po420 and the pump burned up taking the fuze with it.
Hm, not sure how I can test the check valve on the vac side. I can reset it, but it takes a few miles (I tried starting it up and shutting it off a few times, it didn't come back, but when I went for emissions they told me it had not done enough miles since the last reset). Drove for a bit, and the light came back, same code.
From the Saturn forums I've read through, the pump comes on every time you start the car for 15-60 seconds, depending on engine temp. It seems to make sense because I can hear it run for a moment or more every time I start the car - cold or not.
I'm taking it back after my morning meetings. They told me over the phone they pulled a lot of carbon out of the air tube/manifold port using brake cleaner and a brush, and had better readings when they watched using their scanner, but I guess it's still not enough - might need to pull the manifold and clean that out too.