My car wont start my mechanic put it on machine the codes were P0133 P0341 P1599 P1620 he said i need a computer

Here's a link on your P0341 code. http://repairpal.com/obd-ii-code-http://repairpal.com/obd-ii-code-P0341

Check purge valve that could be stuck open

Having codes read is a waste of time, if you don't understand
or work on vehicles

You need a shop to properly diagnose it,you know that

Any codes can be Googled to look them up

Type: OBD & the code

Codes have little to do with replacing parts

No parts get replaced until they are tested & fail a test

Need a different mechanic

They never tested anything,
if you got codes

P1620 code is a thermostat error. it's a picky sensor, and unless you notice anything wrong (like a rough idle, or problems with the operating temperature) I'd ignore it. If you are having issues you may need to replace the MAF sensor located in the thermostat on top of the engine

Resetting the computer isnt going to fix anything. Get it repaired. If you reset it, it still will not pass if the monitors have not run and passed.

CODE PO113 - INTAKE AIR TEMPERATURE SENSOR INPUT ABOVE MAXIMUM ACCEPTABLE RANGE. CODE PO133 - UPSTREAM OXYGEN SENSOR RESPONSE SLOWER THAN MINIMUM REQUIRED SWITCHING FREQUENCY. CODE PO341 - CMP SENSOR SIGNAL RANGE PERFORMANCE CONDITIONS. POSSIBLE CAUSE COULD BE CAMSHAFT POSITION SENSOR FAULTY OR PCM FAULTY GOT TOO MANY CODES. LET DEALERSHIP CHECK IT OUT USING DIAGNOSTIC EQUIPMENT. YOU DONT WONT TO BUY ALL THOSE SENSORS IF PROBLEM ELSE WHERE THE COST WILL ADD UP THAT WHY LET DEALERSHIP CHECK IT OUT.COULD BE THE PCM OR SHORT IN WIRING.

CPS is bad

P1599 IS A STALLING ISSUE COULD BE BAD GAS / BAD FUELPUMP DIRTY FUEL FILTER
DISCONNECT BATTERY AND SEE IF THE LIGHT COMES ON AGAIN
U2107 HAS SOMETHING TO DO WITH THE COMPUTER LOOSING POWER AT THE BODY MOUNTS CHECK CABLES AND GROUND STRAP

Hello DTC P0341 & P0133 very common saturn Codes.You need to check condition of Plugs & wires,If not New Replace All Plugs & Wires,also I would replace the #1#4 Coil for the P0341.For the P0133 Reaplce your front O2 sensor with an OEM sensor,not an aftermarket.