Need Help - 2010 Prius - P2196 + Blinking windows master Switch

NEED HELP.

Just bought this car, while driving for the first time, engine light came on, Mileage is 160,000 Km. Scanned the car with tech stream and found these codes.

P2196

B1206

B2321

B2313

Its an Air fuel ratio sensor code, could it be something else ? Where this sensor located ? is it under the air box or in the back, can I replace it my self ?

Cant unlock or roll down passenger door/window, Same with one of the rear windows.
Passenger door unlock fine when I press PARK. Can roll down passenger and rear window from the switch on those doors, just cant seem to work from master window switch, plus all three windows lights were blinking except driver switch.

Thanks.

 

Private Seller so no I cant take it back.

 

Thanks. Is exhaust manifold under the air box or toward back of the engine ? Any advice on other codes and blinking master switch ?

 

Thanks for the advice.
Cleaned the throtlebody and MAF. But after doing that, now I am getting Knock Sensor P0328 code, plus the P2196.

I could not find the Knock Sensor, in pictures they show its on the front of the engine, but I could not locate. I wanted to check if somehow connector got loose or something. because there was no knock sensor code before. car running of but engine light comes on right away with same codes after deleting the code.

 

I fixed the windows by relearn procedure of windows and all the windows are working fine. My real issue at this time is I have two code P2196 and P0328. I cleaned the MAF and TB in order to try to fix P2196, but after cleaning now I have Knock Sensor P0328, and its keep coming back after deleting the codes. I removed the air box but later find out knock sensor is behind intake manifold which is a lot of work to get access to the knock sensor. I did use sprayed throtle body cleaner a little bit in the TB.