PLEASE HELP: My engine was watered down now has 7 codes! :(

[kirley09]

199 Volkswagen Cabrio base model

So my mom's d u m b a s s friend decided that it was a great idea to take my car to a self service car wash place, open the hood, take the pressure hose and pretty much wash the motor of my car! The car wouldn't start, so he asked a buddy to come and check the hoses, spark plugs, cables, etc , the engine would crank but not start, then from trying too much there was this time when something blew up on the left side of the engine and then some white smoke came along with a really nasty smell. This same blow up happened like 3 more times.
So they had to tow the car to a mechanic and I am not sure what they did, but the car is now running again.
The check engine light was off but I got home I suspected he would have turned the light off , so I used my friend's code reader machine and I found out I had 7 codes!

P1237 Injector Circuit Open Cylinder 1
P1238 Injector Circuit Open Cylinder 2
P1239 Injector Circuit Open Cylinder 3
P1240 Injector Circuit Open Cylinder 4
P0341 Camshaft Position Sensor A - Bank 1 CKT Range/Perf
P1544 Throttle Actuation Potentiometer Signal Too High
P0121 TPS/Pedal Position Sensor A CKT Range/Perf

(((

I'm a female college student and I got less than 2 weeks left on my provisional tags/registration to take the car to pass inspection.....

Please help me figure this out...what do I have to do THANK YOU !