I had car inspected and it failed emission code p-0442 came up, I own a 1998 Buick Century Custom, What does this code mean and how do i fix the problem

You need to have it checked for DTC'S - diagnostic trouble codes to see what the problem is ,then diagnosed , then fixed ! Then the light's will go off ! This means taking it to a qualified repair shop .
SERVICE VEHICLE SOON
The IPC illuminates the SERVICE VEHICLE SOON message in the DIC when the powertrain control module (PCM) detects certain malfunctions that are not related to the emissions system. The IPC receives a class 2 message requesting illumination from the PCM.

Assuming you don't work on your own vehicles,
then a repair shop is the answer

The internet has all the info you need

You study vehicle exhaust emissions & the 5 gases
The answer as to how to correct them, is there

You never go to inspection first

You work on the vehicle first,then go

If you are getting a code saying that there is a problem with your evaporative emission control system, it is often related to the gas cap. In many cases replacing the gas cap will fix the problem.

A code P0440 could mean one or more of the following has happened:

• The gas cap is not installed or working properly
• The purge solenoid has failed
• The canister is plugged and not working properly

Possible Solutions: with a P0440 OBD-II trouble code, diagnosis can be tricky at times. Here are some things to try:

• Remove and reinstall the gas cap, clear the code, and drive for a day and see if the codes come back.
• Inspect the EVAP system for cuts/holes in tubes/hoses
• Inspect for damaged or disconnected hoses around the Evap purge solenoid
• Check and/or replace the sensor
• Check and/or replace the purge valve
• Have a professional use a smoke machine to detect leaks

Keep us updated.

FUEL PRESSURE SENSOR IS PART OF THE EVAPORATIVE EMISSION CONTROL. SYSTEM IT SITS ON TOP OF FUEL TANK.MONITORS GAS PRESSURE IN FUEL TANK.YOU NEED TO FIX CAR WILL FAIL EMISSION TEST AND FAIL STATE INSPECTION.

Have an auto parts store check for the code. It is possible that you have a bad O2 sensor or your catalytic converter is clogged.

What numbers is this No2?Ho2,Co?anyway check for any vacuum leaks,has he clean out the throttle body , test the O2 censer .

You will need to have a reputable mechanic do a diagnostic check on the car to determine the problem. This should pull up a code number in your car's computer and help point the mechanic and you in the direction of the malfunctioning part/s.

Just today, I had a diagnostic check done on mine for nearly $45.00. The mechanic was able to figure out the reason why my service engine light was staying on. I knew my car's radiator fans failed to run when car's engine was hot except when the A/C was running. I had changed out the sensors and was never able to get the light to go out or get the fans working. They were able to determine that the 25 amp fuse for the fans located under the hood was blown. After replacing it, the fans worked as they should, my car runs cooler and the engine service engine light is now out. Of course there are many possible reasons why the service engine light may come on including problems with the car's emissions. A reputable mechanic can solve your problem.

code is evap system flow during non-purge
check the hoses for holes or broken disconnected hoses also check the fuel cap emissions diagram under the hood will give u the location of the evep purge solenoid if all checks ok then replace the soienoid and clear the codes
rank & vote my solution

P1441, EVAP Emissions System Flow During Non-Purge.
you seem to have an evap problem these problems are hard to diagnose sometimes it can only be the gas cap or maybe rust around the seat of the gaz cap
get the code erase and see if it comes back on and if it does check gas cap and arroung the filling neck if there is rust if no visible rust apears you will have to get it check with smoke to see where it leaks

hope it will help you

Have a great day

Denis