Wondering what code p303is, i failed inspection because of it

Depends on the state in which you live. In texas, A traction control light or ABS light won't fail you for an inspection. Or a door handle. As far as a safety issue, I personal issue. Remember, our Parents drove hundreds of thousands of miles without it.

Evap could be numerous things need to smoke test it, catalyst effiency code? could be a leaky exhausts or need to to a pin point test for best results

very much doubt it unless the cat fails for the inspection ,you would be better off buying a diesel variant with a manual gearbox for fuel economy

A large vacuum leak is most likely the cause of this DTC.
Inspect the Intake Manifold and Throttle body for leaks and cracks.
Inspect the Power Brake Booster for any vacuum leaks.
Inspect the PCV system for proper operation or any vacuum leaks.
Inspect the MAP Sensor for proper installation.

you will need to change the catalitic converters. Very common issue and if at all possible do not use after market cats. They will likely cause the same code and cause it to fail inspection.

Any code that puts on the check engine light is a failure for inspection. Your mechanic has given you bad information. What you need to do is fix the code causing problem then drive vehicle for a few days to reset all inspection monitors. You will not pass inspection with a check engine light on unfortunately. Hope this helps.

Hi, a P0446 means Evaporative Emission Control System Vent Control Circuit Malfunction

Full details @ http://www.obd-codes.com/p0446

THAT A NEW ONE ON ME.YOU HAVE TO HAVE CODES TO FAIL EMISSION TEST.NO CODES MEAN YOU PASSED.

This code is associated with the EVAP system which includes, but not limited to gas cap, fuel lines, carbon canister, purge valves. The EVAP system is supposed to prevent fuel vapors from escaping the fuel system

If you have this code, one of the following may have happened:
Gas cap not installed properly or faulty gas cap
Purge solenoid has failed
Canister is plugged and not working properly

This code can be tricky to resolve, but try some of these:
Remove and reinstall the gas cap and or replace the gas cap and clear the code and see if it comes back
Inspect the the hoses, and tubes for any sign of a hole or cut
Inspect for damage or disconnected hoses around the purge solenoid
Check and or replace the sensor
Check and or replace the purge valve

PO336 IS THE CRANKSHAFT POSITION SENSOR WHICH SHOULD BE THE ANSWER TO PASSING INSPECTION SINCE IT IS A PERFORMANCE ISSUE. IT IS RESPONSIBLE FOR FUEL INJECTION AND SPARK PULSE. REPLACING IT SHOULD HELP TO REDUCE EMISSIONS. AND THE SECOND CODE IS AN EVAP LEAK,SMALL. HOPE THIS HELPS. LET ME KNOW. BEST OF LUCK