Error Code P0303 After Oil Change

So just an update:

The car that I inherited I am going to replace the 12v battery with a new one (the old battery is from 2018) and fix the HV cable with self fusing tape and sell the car.

As for my Prius, well, I bought all the tools to do the job, but lost the momentum to actually do the job (still haven't bought the replacement parts/gaskets). But I have become used to implementing a workaround which is every day after work before going inside I just pop the hood open and open the cap for the coolant tank. This releases the build up pressure and in doing so my coolant level has not been decrementing. I know its not a permanent fix but it is a simple and very slight slight inconvenience. I may do it i the future but right now its not worth the time and headache which I can't afford. Plus the car has been driving well and no engine issues.

The only complaint I have now is that it pulls hard to the left while driving. Not sure why. I've brought it in 3 times for alignment but still pulls.

I guess I'll just have to deal with it but its much better than the old Sienna I used to have which had an awful smell and gave me headaches all the time and made me sick from burnt oil smell.