I didn't turn the key all the way when I went to start it,now it will not start. It makes a buzzing noise

Sounds like you have water in some of your distributuin boxes. Remove the covers and blow them out with compressed air.

It sounds like you may have a bad starter or maybe even a bad ignition switch. Then again there is always the possibility that you may just have a bad connection some where. I hope this helps you out.

Your going to have to get the battery checked, you can have 12.6 volts but with no amps, the car won't turn over, it only takes one bad cell to lower the amperage

Check your belts make sure they are all there.

First of all I need the make and model and year of the car to tell you where the battery is.

First of all, common sense tells you, that you didn't need 6 sensors

Codes do not tell you to replace anything
Study OBD2 Systems

I have a problem when someone say for a long time

I assume that means up to six months

If your not a car person capable of diagnosing &
make at least some repairs,then you need a repair
shop ,after a couple of weeks,at least for some issues

Either study cars & obd2 or pay a shop while your learning

Not the Key but the ignition itself. Replace teh ignition module where the key is inserted to start the vehicle and that should resolve the issue.

You may have to tear in, but plan on replaceing EVERYTHING timing chain related.

Sounds like the battery cables might be dirty, or your battery might be going ad.

take the battery out of the veh and see if it will charge overnight on a charger, if not then the bat just ran its course I doubt it is 11 years old. Bats last anywhere from 3 to 5 years then they die if it does charge then your alternator needs to be replaced as it charges the battery when you drive, low voltage may cause the buzzing, tellin gyou there is a problem.