I took out the O2 sensor. It drove ok. So I ordered an aftermarket Catalytic converter, and took the car to a local shop. On fairtax's advice I also ordered a new O2 sensor for the front of the cat pipe.
The car runs fine and that shifting issue was indeed the converter clog. This converter that clogged was an aftermarket converter with a life warranty. I think it was walker. (I called the previous owner, who said he had to put it on about 3 years ago.
I am still throwing a code. I have a cheap code reader and it wasn't telling me what the code is, so I took it to autozone and had them read it. I had them print it out. Now I cant find it. But I'm 95% sure it was a P0420.
This is on my 2000 outback wagon. 2.5 / 4EAT
Coolant leak. I still havnt put it up in the air, it's been cold. Plus my jack needed fixed and I have a replacement now.
But its a coolant leak, my overflow bottle needs topped off at times. I don't see any leaks on the top half. I see some steam, it drips on the down pipe, on the drivers side toward the rear of the engine.
I took it to a local shop. I wanted them to tell me what is leaking. They couldn't find a leak. I told them it does when its running. idk. I left with no diagnosis as to what is leaking. But I think its probably that left side head. I have read that the 2.5 leaks external when there is a head gasket problem. Unlike my 96.
So yeah, this leak and now this code,, which COULD be the reason the cat converters are failing on this car in the past.
lastly, and this isn't really a problem, but this 2000 model is very different from my 1996, in that it seems to easily want to shift into overdrive quickly, and then it seems to stay there a tad too long. like ,, "hey it should have downshifted before now" that kind of thing.
Thanks for any advice / replies.