Catalysic Converter needs replacing my check engine light stayed on took it for diagnostic and this is the results, and that they don't make my model any more

I have a 2005 Chevrolet Malibu for a couple of days it's starting to gave me problems with Electric Power Steering so I took it to a dealership so they told me they fixed the problem reset and Calibrated the car and now two days later found out the car still not fix my car runs like a train. What should I do.

I already have bought a radiator for my car , i just need it put in . I also think I may need new fans , Another issue is the wheel steering it jerks on its own when driving. What is that about ? Lastly , My locks go up and down on its own in the car ? Is that and electrical issue and how much would it cost me to get all of this fixed?

My check engine light had been on for a couple of days thought because it was low on oil but didn't go off after adding more then while driving home my battery light came on as well as the abs light I was able to make it the my driveway about a mile further but when I went to turn I had no powersteering the car ran while I did my best to park it but died shortly after and would not start again just made clicking noises I went inside and about an hour later went and started the car up it worked fine was able to move it everything worked the only light on was check engine light I drove to work the next day and the car worked fine but after work I drove to autozone to be tested on the machine and on the way there the battery light was going on and off the machine said the car wasn't getting up to temperature the guy said my thermostat is probably stuck open then he went to check my atenator but said the battery didn't have enough charge to check it. He said I could make it home though but as I was leaving my steering wheel was jerking and I had no power steering turned the car off then it wouldn't start again. Could it just be my alternator needing replaced or is something else going on with my car?

I've repeatedly checked the tightness of the oil filter and its hand tight. It seems to be leaking where the filter assembly connects to the oil pan. Is there a gasket there that could use replacing? Seem to get actual light smoke pouring out from under car after sitting cold...then goes away. So confused...Seems related

AC is turned to heat but it won't generate heat until I'm at highway speeds. Goes cold when I slow. Defroster is pointless with foggy windows. Barely works. Thoughts?

Steering was fine but recently drags when I turn it even gently. Feels like the days when the power steering fluid was low.

While driving electrical system fades out and engine starts to loose power until eventually stalling. This has happened several times. Mechanics insist that its the alternator, but when removing the alternator and having it tested on a machine it tests good.

I have replaced all bulbs and they keep going bad. Not sure what the problem can be that keep making the bulbs go bad. I even replaced the front headlights and still keep having the same issues.

the motor is a 3500

I would have to wiggle it and turn the key back and forward numerous of times before a click sound is heard and the key would come out.

It jus fell out, what hold it in ?

I just put a new battery in but now when I drive the car stops and say engine power reduce

then gas gauge starting going eratic up and down sometimes full and sometimes empty and hard time refueling lots of pres user and like it was full but it was really full ,and already we

T/C dummy light comes on.. Why.

The bulbs work but the blinker doesn't blink to signal that I am going to make a left turn. What could the problem be?

The rear lights, running lights, flood lights and high beam lights all work. But the license plate light doesn't work. Any thoughts?

Is not the oil. I checked and is ok. I recently change the oil.

Let me add that the alarm has its issues. Works when wants to. Before the incident my mother locked the car and yesterday did not worked. I believe that I could be the computer that burns?